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annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiTarget.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 319860ae697a
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3733
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1 /*
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2 * Copyright (c) 2009, 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 /**
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27 * Represents the target machine for a compiler, including the CPU architecture, the size of pointers and references,
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28 * alignment of stacks, caches, etc.
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29 */
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30 public class CiTarget {
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31 public final CiArchitecture arch;
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32
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33 /**
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34 * The OS page size.
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35 */
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36 public final int pageSize;
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37
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38 /**
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39 * Specifies if this is a multi-processor system.
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40 */
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41 public final boolean isMP;
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42
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43 /**
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44 * The number of {@link #spillSlotSize spill slots} required per kind.
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45 */
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46 private final int[] spillSlotsPerKindMap;
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47
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48 /**
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49 * Specifies if this target supports encoding objects inline in the machine code.
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50 */
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51 public final boolean inlineObjects;
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52
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53 /**
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54 * The spill slot size for values that occupy 1 {@linkplain CiKind#sizeInSlots() Java slot}.
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55 */
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56 public final int spillSlotSize;
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57
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58 /**
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59 * The machine word size on this target.
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60 */
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61 public final int wordSize;
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62
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63 /**
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64 * The CiKind to be used for representing raw pointers and CPU registers.
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65 */
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66 public final CiKind wordKind;
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67
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68 /**
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69 * The stack alignment requirement of the platform. For example,
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70 * from Appendix D of <a href="http://www.intel.com/Assets/PDF/manual/248966.pdf">Intel 64 and IA-32 Architectures Optimization Reference Manual</a>:
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71 * <pre>
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72 * "It is important to ensure that the stack frame is aligned to a
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73 * 16-byte boundary upon function entry to keep local __m128 data,
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74 * parameters, and XMM register spill locations aligned throughout
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75 * a function invocation."
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76 * </pre>
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77 */
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78 public final int stackAlignment;
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79
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80 /**
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81 * @see http://docs.sun.com/app/docs/doc/806-0477/6j9r2e2b9?a=view
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82 */
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83 public final int stackBias;
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84
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85 /**
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86 * The cache alignment.
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87 */
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88 public final int cacheAlignment;
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89
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90 /**
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91 * Specifies how {@code long} and {@code double} constants are to be stored
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92 * in {@linkplain CiFrame frames}. This is useful for VMs such as HotSpot
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93 * where convention the interpreter uses is that the second local
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94 * holds the first raw word of the native long or double representation.
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95 * This is actually reasonable, since locals and stack arrays
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96 * grow downwards in all implementations.
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97 * If, on some machine, the interpreter's Java locals or stack
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98 * were to grow upwards, the embedded doubles would be word-swapped.)
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99 */
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100 public final boolean debugInfoDoubleWordsInSecondSlot;
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101
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102 /**
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103 * Temporary flag to distinguish between the semantics necessary for HotSpot and Maxine.
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104 */
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105 // TODO This should go away when XIR goes away, and the logic be part of the VM-specific lowering.
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106 public final boolean invokeSnippetAfterArguments;
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107
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108 public CiTarget(CiArchitecture arch,
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109 boolean isMP,
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110 int spillSlotSize,
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111 int stackAlignment,
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112 int pageSize,
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113 int cacheAlignment,
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114 boolean inlineObjects,
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115 boolean debugInfoDoubleWordsInSecondSlot,
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116 boolean invokeSnippetAfterArguments) {
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117 this.arch = arch;
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118 this.pageSize = pageSize;
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119 this.isMP = isMP;
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120 this.spillSlotSize = spillSlotSize;
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121 this.wordSize = arch.wordSize;
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122 if (wordSize == 8) {
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123 this.wordKind = CiKind.Long;
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124 } else {
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125 this.wordKind = CiKind.Int;
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126 }
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127 this.stackAlignment = stackAlignment;
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128 this.stackBias = 0; // TODO: configure with param once SPARC port exists
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129 this.cacheAlignment = cacheAlignment;
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130 this.inlineObjects = inlineObjects;
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131 this.spillSlotsPerKindMap = new int[CiKind.values().length];
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132 this.debugInfoDoubleWordsInSecondSlot = debugInfoDoubleWordsInSecondSlot;
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133 this.invokeSnippetAfterArguments = invokeSnippetAfterArguments;
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134
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135 for (CiKind k : CiKind.values()) {
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136 // initialize the number of spill slots required for each kind
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137 int size = sizeInBytes(k);
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138 int slots = 0;
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139 while (slots * spillSlotSize < size) {
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140 slots++;
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141 }
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142 spillSlotsPerKindMap[k.ordinal()] = slots;
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143 }
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144 }
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145
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146 /**
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147 * Gets the size in bytes of the specified kind for this target.
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148 *
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149 * @param kind the kind for which to get the size
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150 * @return the size in bytes of {@code kind}
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151 */
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152 public int sizeInBytes(CiKind kind) {
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153 // Checkstyle: stop
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154 switch (kind) {
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155 case Boolean: return 1;
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156 case Byte: return 1;
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157 case Char: return 2;
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158 case Short: return 2;
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159 case Int: return 4;
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160 case Long: return 8;
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161 case Float: return 4;
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162 case Double: return 8;
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163 case Object: return wordSize;
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164 case Jsr: return 4;
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165 default: return 0;
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166 }
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167 // Checkstyle: resume
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168 }
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169
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170 /**
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171 * Gets the number of spill slots for a specified kind in this target.
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172 * @param kind the kind for which to get the spill slot count
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173 * @return the number of spill slots for {@code kind}
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174 */
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175 public int spillSlots(CiKind kind) {
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176 return spillSlotsPerKindMap[kind.ordinal()];
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177 }
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178
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179 /**
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180 * Aligns the given frame size (without return instruction pointer) to the stack
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181 * alignment size and return the aligned size (without return instruction pointer).
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182 * @param frameSize the initial frame size to be aligned
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183 * @return the aligned frame size
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184 */
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185 public int alignFrameSize(int frameSize) {
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186 int x = frameSize + arch.returnAddressSize + (stackAlignment - 1);
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187 return (x / stackAlignment) * stackAlignment - arch.returnAddressSize;
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188 }
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189 }