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annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/ConstantReflectionProvider.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents f102ee538647
children
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1 /*
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2 * Copyright (c) 2012, 2015, 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.meta;
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24
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25 import java.lang.invoke.MethodHandle;
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26
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27 /**
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28 * Reflection operations on values represented as {@linkplain JavaConstant constants}. All methods
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29 * in this interface require the VM to access the actual object encapsulated in
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30 * {@link JavaKind#Object object} constants. This access is not always possible, depending on kind
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31 * of VM and the state that the VM is in. Therefore, all methods can return {@code null} at any
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32 * time, to indicate that the result is not available at this point. The caller is responsible to
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33 * check for {@code null} results and handle them properly, e.g., not perform an optimization.
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34 */
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35 public interface ConstantReflectionProvider {
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36
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37 /**
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38 * Compares two constants for equality. The equality relationship is symmetric. Returns
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39 * {@link Boolean#TRUE true} if the two constants represent the same run time value,
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40 * {@link Boolean#FALSE false} if they are different. Returns {@code null} if the constants
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41 * cannot be compared at this point.
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42 */
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43 Boolean constantEquals(Constant x, Constant y);
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45 /**
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46 * Returns the length of the array constant. Returns {@code null} if the constant is not an
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47 * array, or if the array length is not available at this point.
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48 */
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49 Integer readArrayLength(JavaConstant array);
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51 /**
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52 * Reads a value from the given array at the given index. Returns {@code null} if the constant
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53 * is not an array, if the index is out of bounds, or if the value is not available at this
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54 * point.
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55 */
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56 JavaConstant readArrayElement(JavaConstant array, int index);
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57
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58 /**
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59 * Gets the current value of this field for a given object, if available.
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60 *
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61 * There is no guarantee that the same value will be returned by this method for a field unless
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62 * the field is considered to be constant by the runtime.
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63 *
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64 * @param receiver object from which this field's value is to be read. This value is ignored if
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65 * this field is static.
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66 * @return the value of this field or {@code null} if the value is not available (e.g., because
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67 * the field holder is not yet initialized).
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68 */
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69 JavaConstant readFieldValue(ResolvedJavaField field, JavaConstant receiver);
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70
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71 /**
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72 * Converts the given {@link JavaKind#isPrimitive() primitive} constant to a boxed
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73 * {@link JavaKind#Object object} constant, according to the Java boxing rules. Returns
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74 * {@code null} if the source is is not a primitive constant, or the boxed value is not
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75 * available at this point.
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76 */
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77 JavaConstant boxPrimitive(JavaConstant source);
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78
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79 /**
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80 * Converts the given {@link JavaKind#Object object} constant to a {@link JavaKind#isPrimitive()
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81 * primitive} constant, according to the Java unboxing rules. Returns {@code null} if the source
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82 * is is not an object constant that can be unboxed, or the unboxed value is not available at
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83 * this point.
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84 */
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85 JavaConstant unboxPrimitive(JavaConstant source);
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86
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87 /**
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88 * Gets a string as a {@link JavaConstant}.
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89 */
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90 JavaConstant forString(String value);
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91
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92 /**
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93 * Returns the {@link ResolvedJavaType} for a {@link Class} object (or any other object regarded
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94 * as a class by the VM) encapsulated in the given constant. Returns {@code null} if the
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95 * constant does not encapsulate a class, or if the type is not available at this point.
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96 */
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97 ResolvedJavaType asJavaType(Constant constant);
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98
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99 /**
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100 * Gets access to the internals of {@link MethodHandle}.
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101 */
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102 MethodHandleAccessProvider getMethodHandleAccess();
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103
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104 /**
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105 * Gets raw memory access.
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106 */
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107 MemoryAccessProvider getMemoryAccessProvider();
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108
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109 /**
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110 * Gets the runtime representation of the {@link Class} object of this type.
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111 */
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112 JavaConstant asJavaClass(ResolvedJavaType type);
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113
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114 /**
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115 * Gets the runtime representation of the "hub" of this type--that is, the closest part of the
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116 * type representation which is typically stored in the object header.
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22757
diff changeset
117 */
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22757
diff changeset
118 Constant asObjectHub(ResolvedJavaType type);
12052
0afe7370260c refactored constantEquals(), lookupArrayLength() and readUnsafeConstant() out of MetaAccessProvider into ConstantReflectionProvider (GRAAL-511)
Doug Simon <doug.simon@oracle.com>
parents:
diff changeset
119 }