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annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/ConstantPool.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/ConstantPool.java@2906b3cc3e2f
children
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1 /*
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2 * Copyright (c) 2009, 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.jvmci.meta;
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24
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25 /**
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26 * Represents the runtime representation of the constant pool that is used by the compiler when
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27 * parsing bytecode. Provides methods to look up a constant pool entry without performing
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28 * resolution. They are used during compilation.
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29 */
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30 public interface ConstantPool {
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31
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32 /**
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33 * Returns the number of entries the constant pool.
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34 *
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35 * @return number of entries in the constant pool
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36 */
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37 int length();
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38
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39 /**
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40 * Ensures that the type referenced by the specified constant pool entry is loaded and
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41 * initialized. This can be used to compile time resolve a type. It works for field, method, or
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42 * type constant pool entries.
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43 *
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44 * @param cpi the index of the constant pool entry that references the type
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45 * @param opcode the opcode of the instruction that references the type
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46 */
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47 void loadReferencedType(int cpi, int opcode);
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48
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49 /**
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50 * Looks up a reference to a field. If {@code opcode} is non-negative, then resolution checks
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51 * specific to the bytecode it denotes are performed if the field is already resolved. Should
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52 * any of these checks fail, an unresolved field reference is returned.
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53 *
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54 * @param cpi the constant pool index
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55 * @param opcode the opcode of the instruction for which the lookup is being performed or
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56 * {@code -1}
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57 * @return a reference to the field at {@code cpi} in this pool
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58 * @throws ClassFormatError if the entry at {@code cpi} is not a field
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59 */
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60 JavaField lookupField(int cpi, int opcode);
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61
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62 /**
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63 * Looks up a reference to a method. If {@code opcode} is non-negative, then resolution checks
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64 * specific to the bytecode it denotes are performed if the method is already resolved. Should
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65 * any of these checks fail, an unresolved method reference is returned.
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66 *
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67 * @param cpi the constant pool index
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68 * @param opcode the opcode of the instruction for which the lookup is being performed or
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69 * {@code -1}
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70 * @return a reference to the method at {@code cpi} in this pool
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71 * @throws ClassFormatError if the entry at {@code cpi} is not a method
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72 */
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73 JavaMethod lookupMethod(int cpi, int opcode);
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75 /**
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76 * Looks up a reference to a type. If {@code opcode} is non-negative, then resolution checks
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77 * specific to the bytecode it denotes are performed if the type is already resolved. Should any
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78 * of these checks fail, an unresolved type reference is returned.
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79 *
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80 * @param cpi the constant pool index
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81 * @param opcode the opcode of the instruction for which the lookup is being performed or
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82 * {@code -1}
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83 * @return a reference to the compiler interface type
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84 */
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85 JavaType lookupType(int cpi, int opcode);
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87 /**
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88 * Looks up an Utf8 string.
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89 *
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90 * @param cpi the constant pool index
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91 * @return the Utf8 string at index {@code cpi} in this constant pool
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92 */
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93 String lookupUtf8(int cpi);
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94
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95 /**
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96 * Looks up a method signature.
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97 *
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98 * @param cpi the constant pool index
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99 * @return the method signature at index {@code cpi} in this constant pool
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100 */
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101 Signature lookupSignature(int cpi);
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102
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103 /**
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104 * Looks up a constant at the specified index.
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105 *
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106 * @param cpi the constant pool index
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107 * @return the {@code Constant} or {@code JavaType} instance representing the constant pool
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108 * entry
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109 */
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110 Object lookupConstant(int cpi);
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111
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112 /**
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113 * Looks up the appendix at the specified index.
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114 *
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115 * @param cpi the constant pool index
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116 * @param opcode the opcode of the instruction for which the lookup is being performed or
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117 * {@code -1}
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118 * @return the appendix if it exists and is resolved or {@code null}
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119 */
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120 JavaConstant lookupAppendix(int cpi, int opcode);
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121 }