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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiTarget.java @ 5507:dc71b06d09f8

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Moving classes from cri.ri to api.meta.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 07 Jun 2012 18:24:06 +0200
parents 452f91ebdb54
children
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1 /*
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2 * Copyright (c) 2009, 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.max.cri.ci;
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24
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25 import com.oracle.graal.api.meta.*;
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26
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27
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28 /**
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29 * Represents the target machine for a compiler, including the CPU architecture, the size of pointers and references,
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30 * alignment of stacks, caches, etc.
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31 */
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32 public class CiTarget {
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33 public final CiArchitecture arch;
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34
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35 /**
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36 * The OS page size.
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37 */
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38 public final int pageSize;
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39
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40 /**
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41 * Specifies if this is a multi-processor system.
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42 */
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43 public final boolean isMP;
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44
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45 /**
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46 * Specifies if this target supports encoding objects inline in the machine code.
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47 */
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48 public final boolean inlineObjects;
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49
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50 /**
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51 * The machine word size on this target.
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52 */
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53 public final int wordSize;
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54
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55 /**
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56 * The CiKind to be used for representing raw pointers and CPU registers.
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57 */
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58 public final RiKind wordKind;
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59
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60 /**
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61 * The stack alignment requirement of the platform. For example,
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62 * 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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63 * <pre>
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64 * "It is important to ensure that the stack frame is aligned to a
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65 * 16-byte boundary upon function entry to keep local __m128 data,
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66 * parameters, and XMM register spill locations aligned throughout
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67 * a function invocation."
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68 * </pre>
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69 */
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70 public final int stackAlignment;
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71
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72 /**
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73 * @see http://docs.sun.com/app/docs/doc/806-0477/6j9r2e2b9?a=view
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74 */
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75 public final int stackBias;
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76
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77 /**
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78 * The cache alignment.
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79 */
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80 public final int cacheAlignment;
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81
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82 /**
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83 * Specifies how {@code long} and {@code double} constants are to be stored
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84 * in {@linkplain CiFrame frames}. This is useful for VMs such as HotSpot
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85 * where convention the interpreter uses is that the second local
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86 * holds the first raw word of the native long or double representation.
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87 * This is actually reasonable, since locals and stack arrays
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88 * grow downwards in all implementations.
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89 * If, on some machine, the interpreter's Java locals or stack
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90 * were to grow upwards, the embedded doubles would be word-swapped.)
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91 */
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92 public final boolean debugInfoDoubleWordsInSecondSlot;
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93
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94 /**
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95 * Temporary flag to distinguish between the semantics necessary for HotSpot and Maxine.
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96 */
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97 // TODO This should go away when XIR goes away, and the logic be part of the VM-specific lowering.
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98 public final boolean invokeSnippetAfterArguments;
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99
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100 public CiTarget(CiArchitecture arch,
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101 boolean isMP,
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102 int stackAlignment,
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103 int pageSize,
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104 int cacheAlignment,
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105 boolean inlineObjects,
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106 boolean debugInfoDoubleWordsInSecondSlot,
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107 boolean invokeSnippetAfterArguments) {
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108 this.arch = arch;
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109 this.pageSize = pageSize;
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110 this.isMP = isMP;
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111 this.wordSize = arch.wordSize;
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112 if (wordSize == 8) {
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113 this.wordKind = RiKind.Long;
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114 } else {
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115 this.wordKind = RiKind.Int;
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116 }
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117 this.stackAlignment = stackAlignment;
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118 this.stackBias = 0; // TODO: configure with param once SPARC port exists
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119 this.cacheAlignment = cacheAlignment;
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120 this.inlineObjects = inlineObjects;
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121 this.debugInfoDoubleWordsInSecondSlot = debugInfoDoubleWordsInSecondSlot;
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122 this.invokeSnippetAfterArguments = invokeSnippetAfterArguments;
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123 }
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124
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125 /**
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126 * Gets the size in bytes of the specified kind for this target.
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127 *
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128 * @param kind the kind for which to get the size
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129 * @return the size in bytes of {@code kind}
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130 */
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131 public int sizeInBytes(RiKind kind) {
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132 // Checkstyle: stop
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133 switch (kind) {
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134 case Boolean: return 1;
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135 case Byte: return 1;
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136 case Char: return 2;
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137 case Short: return 2;
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138 case Int: return 4;
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139 case Long: return 8;
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140 case Float: return 4;
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141 case Double: return 8;
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142 case Object: return wordSize;
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143 case Jsr: return 4;
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144 default: return 0;
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145 }
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146 // Checkstyle: resume
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147 }
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148
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149 /**
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150 * Aligns the given frame size (without return instruction pointer) to the stack
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151 * alignment size and return the aligned size (without return instruction pointer).
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152 * @param frameSize the initial frame size to be aligned
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153 * @return the aligned frame size
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154 */
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155 public int alignFrameSize(int frameSize) {
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156 int x = frameSize + arch.returnAddressSize + (stackAlignment - 1);
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157 return (x / stackAlignment) * stackAlignment - arch.returnAddressSize;
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158 }
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159 }