Mercurial > hg > graal-jvmci-8

annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/TargetDescription.java @ 24218:719853999215 jvmci-0.32

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Merge with jdk8u141-b15
author Doug Simon <doug.simon@oracle.com>
date Mon, 14 Aug 2017 23:20:38 +0200
parents 9ed5b586018b
children
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1 /*
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2 * Copyright (c) 2009, 2016, 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 jdk.vm.ci.code;
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24
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25 import static jdk.vm.ci.meta.MetaUtil.identityHashCodeString;
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26
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27 import jdk.vm.ci.meta.JavaKind;
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28
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29 /**
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30 * Represents the target machine for a compiler, including the CPU architecture, the size of
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31 * pointers and references, alignment of stacks, caches, etc.
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32 */
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33 public class TargetDescription {
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34
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35 public final Architecture arch;
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36
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37 /**
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38 * Specifies if this is a multi-processor system.
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39 */
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40 public final boolean isMP;
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41
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42 /**
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43 * Specifies if this target supports encoding objects inline in the machine code.
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44 */
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45 public final boolean inlineObjects;
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46
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47 /**
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48 * The machine word size on this target.
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49 */
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50 public final int wordSize;
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51
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52 /**
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53 * The {@link JavaKind} to be used for representing raw pointers and CPU registers in Java code.
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54 */
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55 public final JavaKind wordJavaKind;
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56
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57 /**
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58 * The stack alignment requirement of the platform. For example, from Appendix D of
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59 * <a href="http://www.intel.com/Assets/PDF/manual/248966.pdf">Intel 64 and IA-32 Architectures
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60 * Optimization Reference Manual</a>:
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61 *
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62 * <pre>
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63 * "It is important to ensure that the stack frame is aligned to a
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64 * 16-byte boundary upon function entry to keep local __m128 data,
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65 * parameters, and XMM register spill locations aligned throughout
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66 * a function invocation."
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67 * </pre>
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68 */
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69 public final int stackAlignment;
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70
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71 /**
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72 * Maximum constant displacement at which a memory access can no longer be an implicit null
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73 * check.
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74 */
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75 public final int implicitNullCheckLimit;
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76
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77 public TargetDescription(Architecture arch, boolean isMP, int stackAlignment, int implicitNullCheckLimit, boolean inlineObjects) {
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78 this.arch = arch;
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79 this.isMP = isMP;
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80 this.wordSize = arch.getWordSize();
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81 this.wordJavaKind = JavaKind.fromWordSize(wordSize);
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82 this.stackAlignment = stackAlignment;
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83 this.implicitNullCheckLimit = implicitNullCheckLimit;
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84 this.inlineObjects = inlineObjects;
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85
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86 assert arch.getPlatformKind(wordJavaKind).equals(arch.getWordKind());
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87 }
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88
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89 @Override
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90 public final int hashCode() {
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91 throw new UnsupportedOperationException();
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92 }
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93
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94 @Override
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95 public final boolean equals(Object obj) {
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96 if (this == obj) {
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97 return true;
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98 }
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99 if (obj instanceof TargetDescription) {
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100 TargetDescription that = (TargetDescription) obj;
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101 // @formatter:off
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102 if (this.implicitNullCheckLimit == that.implicitNullCheckLimit &&
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103 this.inlineObjects == that.inlineObjects &&
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104 this.isMP == that.isMP &&
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105 this.stackAlignment == that.stackAlignment &&
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106 this.wordJavaKind.equals(that.wordJavaKind) &&
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107 this.wordSize == that.wordSize &&
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108 this.arch.equals(that.arch)) {
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109 return true;
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110 }
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111 // @formatter:on
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112 }
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113 return false;
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114 }
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115
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116 @Override
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117 public String toString() {
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118 return identityHashCodeString(this);
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119 }
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120 }