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annotate graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/StackSlot.java @ 7530:5e3d1a68664e

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applied mx eclipseformat to all Java files
author Doug Simon <doug.simon@oracle.com>
date Wed, 23 Jan 2013 16:34:57 +0100
parents 2463eb24b644
children 4e1278443941
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1 /*
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2 * Copyright (c) 2010, 2012, 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.graal.api.code;
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24
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25 import static com.oracle.graal.api.meta.Kind.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28
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29 /**
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30 * Represents a compiler spill slot or an outgoing stack-based argument in a method's frame or an
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31 * incoming stack-based argument in a method's {@linkplain #isInCallerFrame() caller's frame}.
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32 */
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33 public final class StackSlot extends Value {
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34
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35 private static final long serialVersionUID = -7725071921307318433L;
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36
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37 private final int offset;
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38 private final boolean addFrameSize;
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39
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40 /**
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41 * Gets a {@link StackSlot} instance representing a stack slot at a given index holding a value
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42 * of a given kind.
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43 *
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44 * @param kind The kind of the value stored in the stack slot.
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45 * @param offset The offset of the stack slot (in bytes)
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46 * @param addFrameSize Specifies if the offset is relative to the stack pointer, or the
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47 * beginning of the frame (stack pointer + total frame size).
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48 */
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49 public static StackSlot get(Kind kind, int offset, boolean addFrameSize) {
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50 assert kind.getStackKind() == kind;
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51 assert addFrameSize || offset >= 0;
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52
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53 if (offset % CACHE_GRANULARITY == 0) {
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54 StackSlot[][] cache;
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55 int index = offset / CACHE_GRANULARITY;
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56 if (!addFrameSize) {
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57 cache = OUT_CACHE;
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58 } else if (offset >= 0) {
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59 cache = IN_CACHE;
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60 } else {
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61 cache = SPILL_CACHE;
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62 index = -index;
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63 }
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64 StackSlot[] slots = cache[kind.ordinal()];
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65 if (index < slots.length) {
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66 StackSlot slot = slots[index];
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67 assert slot.getKind() == kind && slot.offset == offset && slot.addFrameSize == addFrameSize;
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68 return slot;
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69 }
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70 }
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71 return new StackSlot(kind, offset, addFrameSize);
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72 }
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74 /**
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75 * Private constructor to enforce use of {@link #get(Kind, int, boolean)} so that a cache can be
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76 * used.
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77 */
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78 private StackSlot(Kind kind, int offset, boolean addFrameSize) {
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79 super(kind);
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80 this.offset = offset;
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81 this.addFrameSize = addFrameSize;
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82 }
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84 /**
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85 * Gets the offset of this stack slot, relative to the stack pointer.
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86 *
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87 * @return The offset of this slot (in bytes).
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88 */
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89 public int getOffset(int totalFrameSize) {
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90 assert totalFrameSize > 0 || !addFrameSize;
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91 int result = offset + (addFrameSize ? totalFrameSize : 0);
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92 assert result >= 0;
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93 return result;
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94 }
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95
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96 public boolean isInCallerFrame() {
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97 return addFrameSize && offset >= 0;
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98 }
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99
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100 public int getRawOffset() {
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101 return offset;
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102 }
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103
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104 public boolean getRawAddFrameSize() {
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105 return addFrameSize;
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106 }
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107
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108 @Override
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109 public int hashCode() {
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110 return getKind().ordinal() ^ (offset << 4) ^ (addFrameSize ? 15 : 0);
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111 }
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112
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113 @Override
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114 public boolean equals(Object o) {
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115 if (o == this) {
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116 return true;
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117 }
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118 if (o instanceof StackSlot) {
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119 StackSlot l = (StackSlot) o;
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120 return l.getKind() == getKind() && l.offset == offset && l.addFrameSize == addFrameSize;
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121 }
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122 return false;
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123 }
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124
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125 @Override
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126 public String toString() {
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127 if (!addFrameSize) {
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128 return "out:" + offset + getKindSuffix();
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129 } else if (offset >= 0) {
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130 return "in:" + offset + getKindSuffix();
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131 } else {
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132 return "stack:" + (-offset) + getKindSuffix();
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133 }
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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 StackSlot asOutArg() {
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140 assert offset >= 0;
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141 if (addFrameSize) {
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142 return get(getKind(), offset, false);
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143 }
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144 return this;
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145 }
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146
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147 /**
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148 * Gets this stack slot used to pass an argument from the perspective of a callee.
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149 */
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150 public StackSlot asInArg() {
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151 assert offset >= 0;
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152 if (!addFrameSize) {
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153 return get(getKind(), offset, true);
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154 }
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155 return this;
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156 }
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157
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158 private static final int CACHE_GRANULARITY = 8;
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159 private static final int SPILL_CACHE_PER_KIND_SIZE = 100;
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160 private static final int PARAM_CACHE_PER_KIND_SIZE = 10;
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161
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162 private static final StackSlot[][] SPILL_CACHE = makeCache(SPILL_CACHE_PER_KIND_SIZE, -1, true);
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163 private static final StackSlot[][] IN_CACHE = makeCache(PARAM_CACHE_PER_KIND_SIZE, 1, true);
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164 private static final StackSlot[][] OUT_CACHE = makeCache(PARAM_CACHE_PER_KIND_SIZE, 1, false);
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165
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166 private static StackSlot[][] makeCache(int cachePerKindSize, int sign, boolean addFrameSize) {
6328
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diff changeset
167 StackSlot[][] cache = new StackSlot[Kind.values().length][];
7530
5e3d1a68664e applied mx eclipseformat to all Java files
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diff changeset
168 for (Kind kind : new Kind[]{Illegal, Int, Long, Float, Double, Object, Jsr}) {
5547
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169 StackSlot[] slots = new StackSlot[cachePerKindSize];
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170 for (int i = 0; i < cachePerKindSize; i++) {
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diff changeset
171 slots[i] = new StackSlot(kind, sign * i * CACHE_GRANULARITY, addFrameSize);
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172 }
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diff changeset
173 cache[kind.ordinal()] = slots;
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174 }
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175 return cache;
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176 }
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177 }