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annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/ci/CiTarget.java @ 4199:aaac4894175c

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Renamed cri packages from sun to oracle.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 03 Jan 2012 16:29:28 +0100
parents graal/com.oracle.max.cri/src/com/sun/cri/ci/CiTarget.java@319860ae697a
children 438ab53efdd0
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1 /*
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319860ae697a Simplify FrameMap: make offsets of spill slots and outgoing parameters independent so that they can be allocated at the same time, eliminating the separate phases. This makes the separate StackBlock unnecesary. Change CiStackSlot to use byte offsets instead of spill slot index. This makes CiTarget.spillSlotSize unnecessary.
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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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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 * Specifies if this target supports encoding objects inline in the machine code.
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45 */
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46 public final boolean inlineObjects;
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47
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48 /**
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49 * The machine word size on this target.
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50 */
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51 public final int wordSize;
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52
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53 /**
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54 * The CiKind to be used for representing raw pointers and CPU registers.
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55 */
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56 public final CiKind wordKind;
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57
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58 /**
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59 * The stack alignment requirement of the platform. For example,
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60 * 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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61 * <pre>
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62 * "It is important to ensure that the stack frame is aligned to a
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63 * 16-byte boundary upon function entry to keep local __m128 data,
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64 * parameters, and XMM register spill locations aligned throughout
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65 * a function invocation."
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66 * </pre>
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67 */
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68 public final int stackAlignment;
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69
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70 /**
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71 * @see http://docs.sun.com/app/docs/doc/806-0477/6j9r2e2b9?a=view
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72 */
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73 public final int stackBias;
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74
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75 /**
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76 * The cache alignment.
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77 */
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78 public final int cacheAlignment;
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79
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80 /**
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81 * Specifies how {@code long} and {@code double} constants are to be stored
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82 * in {@linkplain CiFrame frames}. This is useful for VMs such as HotSpot
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83 * where convention the interpreter uses is that the second local
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84 * holds the first raw word of the native long or double representation.
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85 * This is actually reasonable, since locals and stack arrays
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86 * grow downwards in all implementations.
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87 * If, on some machine, the interpreter's Java locals or stack
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88 * were to grow upwards, the embedded doubles would be word-swapped.)
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89 */
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90 public final boolean debugInfoDoubleWordsInSecondSlot;
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91
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92 /**
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93 * Temporary flag to distinguish between the semantics necessary for HotSpot and Maxine.
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94 */
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95 // TODO This should go away when XIR goes away, and the logic be part of the VM-specific lowering.
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96 public final boolean invokeSnippetAfterArguments;
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97
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98 public CiTarget(CiArchitecture arch,
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99 boolean isMP,
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100 int stackAlignment,
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101 int pageSize,
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102 int cacheAlignment,
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103 boolean inlineObjects,
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104 boolean debugInfoDoubleWordsInSecondSlot,
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105 boolean invokeSnippetAfterArguments) {
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106 this.arch = arch;
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107 this.pageSize = pageSize;
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108 this.isMP = isMP;
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109 this.wordSize = arch.wordSize;
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110 if (wordSize == 8) {
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111 this.wordKind = CiKind.Long;
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112 } else {
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113 this.wordKind = CiKind.Int;
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114 }
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115 this.stackAlignment = stackAlignment;
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116 this.stackBias = 0; // TODO: configure with param once SPARC port exists
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117 this.cacheAlignment = cacheAlignment;
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118 this.inlineObjects = inlineObjects;
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119 this.debugInfoDoubleWordsInSecondSlot = debugInfoDoubleWordsInSecondSlot;
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120 this.invokeSnippetAfterArguments = invokeSnippetAfterArguments;
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121 }
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122
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123 /**
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124 * Gets the size in bytes of the specified kind for this target.
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125 *
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126 * @param kind the kind for which to get the size
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127 * @return the size in bytes of {@code kind}
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128 */
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129 public int sizeInBytes(CiKind kind) {
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130 // Checkstyle: stop
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131 switch (kind) {
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132 case Boolean: return 1;
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133 case Byte: return 1;
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134 case Char: return 2;
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135 case Short: return 2;
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136 case Int: return 4;
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137 case Long: return 8;
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138 case Float: return 4;
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139 case Double: return 8;
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140 case Object: return wordSize;
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141 case Jsr: return 4;
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142 default: return 0;
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143 }
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144 // Checkstyle: resume
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145 }
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146
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147 /**
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148 * Aligns the given frame size (without return instruction pointer) to the stack
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149 * alignment size and return the aligned size (without return instruction pointer).
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150 * @param frameSize the initial frame size to be aligned
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151 * @return the aligned frame size
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152 */
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153 public int alignFrameSize(int frameSize) {
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154 int x = frameSize + arch.returnAddressSize + (stackAlignment - 1);
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155 return (x / stackAlignment) * stackAlignment - arch.returnAddressSize;
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156 }
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157 }