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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/ConstantReflectionProvider.java @ 15023:652564fe42d5

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Use CompressionNode for accessing compressed Klass pointers.
author Roland Schatz <roland.schatz@oracle.com>
date Tue, 08 Apr 2014 15:55:18 +0200
parents db4254246f9a
children 9619ba4daf4c
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1 /*
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2 * Copyright (c) 2012, 2014, 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.graal.api.meta;
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24
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25 /**
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26 * Reflection operations on values represented as {@linkplain Constant constants}. All methods in
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27 * this interface require the VM to access the actual object encapsulated in {@link Kind#Object
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28 * object} constants. This access is not always possible, depending on kind of VM and the state that
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29 * the VM is in. Therefore, all methods can return {@code null} at any time, to indicate that the
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30 * result is not available at this point. The caller is responsible to check for {@code null}
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31 * results and handle them properly, e.g., not perform an optimization.
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32 */
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33 public interface ConstantReflectionProvider {
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34
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35 /**
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36 * Compares two constants for equality. The equality relationship is symmetric. Returns
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37 * {@link Boolean#TRUE true} if the two constants represent the same run time value,
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38 * {@link Boolean#FALSE false} if they are different. Returns {@code null} if the constants
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39 * cannot be compared at this point.
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40 */
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41 Boolean constantEquals(Constant x, Constant y);
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42
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43 /**
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44 * Returns the length of the array constant. Returns {@code null} if the constant is not an
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45 * array, or if the array length is not available at this point.
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46 */
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47 Integer readArrayLength(Constant array);
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48
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49 /**
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50 * Reads a value from the given array at the given index. Returns {@code null} if the constant
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51 * is not an array, if the index is out of bounds, or if the value is not available at this
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52 * point.
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53 */
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54 Constant readArrayElement(Constant array, int index);
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55
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56 /**
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57 * Reads a value of this kind using a base address and a displacement. No bounds checking or
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58 * type checking is performed. Returns {@code null} if the value is not available at this point.
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59 *
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60 * @param base the base address from which the value is read.
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61 * @param displacement the displacement within the object in bytes
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62 * @return the read value encapsulated in a {@link Constant} object, or {@code null} if the
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63 * value cannot be read.
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64 */
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65 Constant readUnsafeConstant(Kind kind, Constant base, long displacement);
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66
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67 /**
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68 * Reads a primitive value using a base address and a displacement.
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69 *
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70 * @param kind the {@link Kind} of the returned {@link Constant} object
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71 * @param base the base address from which the value is read
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72 * @param displacement the displacement within the object in bytes
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73 * @param bits the number of bits to read from memory
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74 * @return the read value encapsulated in a {@link Constant} object of {@link Kind} kind
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75 */
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76 Constant readRawConstant(Kind kind, Constant base, long displacement, int bits);
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77
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78 /**
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79 * Converts the given {@link Kind#isPrimitive() primitive} constant to a boxed
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80 * {@link Kind#Object object} constant, according to the Java boxing rules. Returns {@code null}
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81 * if the source is is not a primitive constant, or the boxed value is not available at this
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82 * point.
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83 */
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84 Constant boxPrimitive(Constant source);
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85
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86 /**
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87 * Converts the given {@link Kind#Object object} constant to a {@link Kind#isPrimitive()
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88 * primitive} constant, according to the Java unboxing rules. Returns {@code null} if the source
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89 * is is not an object constant that can be unboxed, or the unboxed value is not available at
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90 * this point.
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91 */
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92 Constant unboxPrimitive(Constant source);
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93
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94 /**
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95 * Returns the {@link ResolvedJavaType} for a {@link Class} object (or any other object regarded
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96 * as a class by the VM) encapsulated in the given constant. Returns {@code null} if the
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97 * constant does not encapsulate a class, or if the type is not available at this point.
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98 */
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99 ResolvedJavaType asJavaType(Constant constant);
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100 }