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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/ConstantReflectionProvider.java @ 18359:a3a2359ac88e
Support constant folding of pointer reads.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Tue, 11 Nov 2014 18:34:21 +0100 |
parents | 17bf458cf86e |
children | f0a8b72315c1 |
rev | line source |
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12052
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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 JavaConstant constants}. All methods |
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27 * in 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 extends Remote { |
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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(JavaConstant 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 JavaConstant readArrayElement(JavaConstant 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 JavaConstant} 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 JavaConstant readUnsafeConstant(Kind kind, JavaConstant 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 JavaConstant} 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 JavaConstant readRawConstant(Kind kind, Constant base, long displacement, int bits); |
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77 |
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78 /** |
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79 * Reads a pointer value using a base address and a displacement. |
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80 * |
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81 * @param type the {@link PointerType} of the returned {@link Constant} object |
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82 * @param base the base address from which the value is read |
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83 * @param displacement the displacement within the object in bytes |
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84 * @return the read value encapsulated in a {@link Constant} object |
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85 */ |
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86 Constant readPointerConstant(PointerType type, Constant base, long displacement); |
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87 |
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88 /** |
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89 * Converts the given {@link Kind#isPrimitive() primitive} constant to a boxed |
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90 * {@link Kind#Object object} constant, according to the Java boxing rules. Returns {@code null} |
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91 * if the source is is not a primitive constant, or the boxed value is not available at this |
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92 * point. |
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93 */ |
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94 JavaConstant boxPrimitive(JavaConstant source); |
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95 |
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96 /** |
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97 * Converts the given {@link Kind#Object object} constant to a {@link Kind#isPrimitive() |
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98 * primitive} constant, according to the Java unboxing rules. Returns {@code null} if the source |
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99 * is is not an object constant that can be unboxed, or the unboxed value is not available at |
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100 * this point. |
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101 */ |
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102 JavaConstant unboxPrimitive(JavaConstant source); |
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103 |
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104 /** |
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105 * Gets a string as a {@link JavaConstant}. |
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106 */ |
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107 JavaConstant forString(String value); |
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108 |
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109 /** |
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110 * Returns the {@link ResolvedJavaType} for a {@link Class} object (or any other object regarded |
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111 * as a class by the VM) encapsulated in the given constant. Returns {@code null} if the |
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112 * constant does not encapsulate a class, or if the type is not available at this point. |
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113 */ |
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114 ResolvedJavaType asJavaType(JavaConstant constant); |
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115 } |