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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameSlot.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents cda3eebfa777
children
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a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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1 /*
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2 * Copyright (c) 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.frame;
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26
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27 import com.oracle.truffle.api.CompilerDirectives;
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28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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29
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30 /**
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31 * A slot in a {@link Frame} and {@link FrameDescriptor} that can store a value of a given type.
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32 */
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33 public final class FrameSlot implements Cloneable {
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34
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35 private final FrameDescriptor descriptor;
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36 private final Object identifier;
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37 private final Object info;
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38 private final int index;
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39 @CompilationFinal private FrameSlotKind kind;
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40
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41 /**
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42 * @deprecated use
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43 * {@link FrameDescriptor#addFrameSlot(java.lang.Object, java.lang.Object, com.oracle.truffle.api.frame.FrameSlotKind)}
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44 * to create new instance of the slot. This method will be made package private in
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45 * the future.
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46 */
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47 @Deprecated
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48 public FrameSlot(FrameDescriptor descriptor, Object identifier, Object info, int index, FrameSlotKind kind) {
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49 this(descriptor, identifier, info, kind, index);
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50 }
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51
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52 FrameSlot(FrameDescriptor descriptor, Object identifier, Object info, FrameSlotKind kind, int index) {
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53 this.descriptor = descriptor;
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54 this.identifier = identifier;
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55 this.info = info;
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56 this.index = index;
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57 this.kind = kind;
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58 }
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59
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60 /**
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61 * Identifier of the slot.
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62 *
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63 * @return value as specified in {@link FrameDescriptor#addFrameSlot(java.lang.Object)}
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64 * parameter
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65 */
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66 public Object getIdentifier() {
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67 return identifier;
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68 }
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69
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70 /**
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71 * Information about the slot.
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72 *
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73 * @return value as specified as second parameter of
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74 * {@link FrameDescriptor#addFrameSlot(java.lang.Object, java.lang.Object, com.oracle.truffle.api.frame.FrameSlotKind)}
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75 */
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76 public Object getInfo() {
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77 return info;
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78 }
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79
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80 /**
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81 * Index of the slot in the {@link FrameDescriptor}.
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82 *
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83 * @return position of the slot computed after
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84 * {@link FrameDescriptor#addFrameSlot(java.lang.Object, java.lang.Object, com.oracle.truffle.api.frame.FrameSlotKind)
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85 * adding} it.
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86 */
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87 public int getIndex() {
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88 return index;
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89 }
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90
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91 /**
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92 * Kind of the slot. Specified either at
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93 * {@link FrameDescriptor#addFrameSlot(java.lang.Object, com.oracle.truffle.api.frame.FrameSlotKind)
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94 * creation time} or updated via {@link #setKind(com.oracle.truffle.api.frame.FrameSlotKind)}
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95 * method.
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96 *
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97 * @return current kind of this slot
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98 */
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99 public FrameSlotKind getKind() {
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100 return kind;
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101 }
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102
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103 /**
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104 * Changes the kind of this slot. Change of the slot kind is done on <em>slow path</em> and
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Jaroslav Tulach <jaroslav.tulach@oracle.com>
parents: 22157
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105 * invalidates assumptions about {@link FrameDescriptor#createVersion() version} of
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106 * {@link #getFrameDescriptor() associated descriptor}.
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107 *
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108 * @param kind new kind of the slot
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109 */
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110 public void setKind(final FrameSlotKind kind) {
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111 if (this.kind != kind) {
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112 CompilerDirectives.transferToInterpreter();
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113 this.kind = kind;
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114 this.descriptor.updateVersion();
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115 }
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116 }
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Doug Simon <doug.simon@oracle.com>
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117
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118 @Override
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119 public String toString() {
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120 return "[" + index + "," + identifier + "," + kind + "]";
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121 }
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122
22522
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123 /**
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124 * Frame descriptor this slot is associated with.
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125 *
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126 * @return instance of descriptor that {@link FrameDescriptor#addFrameSlot(java.lang.Object)
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127 * created} the slot
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128 */
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129 public FrameDescriptor getFrameDescriptor() {
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130 return this.descriptor;
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131 }
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a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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132 }