Mercurial > hg > truffle
annotate src/share/vm/ci/ciField.hpp @ 196:d1605aabd0a1 jdk7-b30
6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell
| author | xdono |
|---|---|
| date | Wed, 02 Jul 2008 12:55:16 -0700 |
| parents | d5fc211aea19 |
| children | dd57230ba8fe |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // ciField | |
| 26 // | |
| 27 // This class represents the result of a field lookup in the VM. | |
| 28 // The lookup may not succeed, in which case the information in | |
| 29 // the ciField will be incomplete. | |
| 30 class ciField : public ResourceObj { | |
| 31 CI_PACKAGE_ACCESS | |
| 32 friend class ciEnv; | |
| 33 friend class ciInstanceKlass; | |
| 34 friend class NonStaticFieldFiller; | |
| 35 | |
| 36 private: | |
| 37 ciFlags _flags; | |
| 38 ciInstanceKlass* _holder; | |
| 39 ciSymbol* _name; | |
| 40 ciSymbol* _signature; | |
| 41 ciType* _type; | |
| 42 int _offset; | |
| 43 bool _is_constant; | |
| 44 ciInstanceKlass* _known_to_link_with; | |
| 45 ciConstant _constant_value; | |
| 46 | |
| 47 // Used for will_link | |
| 48 int _cp_index; | |
| 49 | |
| 50 ciType* compute_type(); | |
| 51 ciType* compute_type_impl(); | |
| 52 | |
| 53 ciField(ciInstanceKlass* klass, int index); | |
| 54 ciField(fieldDescriptor* fd); | |
| 55 | |
| 56 // shared constructor code | |
| 57 void initialize_from(fieldDescriptor* fd); | |
| 58 | |
| 59 // The implementation of the print method. | |
| 60 void print_impl(outputStream* st); | |
| 61 | |
| 62 public: | |
| 63 ciFlags flags() { return _flags; } | |
| 64 | |
| 65 // Of which klass is this field a member? | |
| 66 // | |
| 67 // Usage note: the declared holder of a field is the class | |
| 68 // referenced by name in the bytecodes. The canonical holder | |
| 69 // is the most general class which holds the field. This | |
| 70 // method returns the canonical holder. The declared holder | |
| 71 // can be accessed via a method in ciBytecodeStream. | |
| 72 // | |
| 73 // Ex. | |
| 74 // class A { | |
| 75 // public int f = 7; | |
| 76 // } | |
| 77 // class B extends A { | |
| 78 // public void test() { | |
| 79 // System.out.println(f); | |
| 80 // } | |
| 81 // } | |
| 82 // | |
| 83 // A java compiler is permitted to compile the access to | |
| 84 // field f as: | |
| 85 // | |
| 86 // getfield B.f | |
| 87 // | |
| 88 // In that case the declared holder of f would be B and | |
| 89 // the canonical holder of f would be A. | |
| 90 ciInstanceKlass* holder() { return _holder; } | |
| 91 | |
| 92 // Name of this field? | |
| 93 ciSymbol* name() { return _name; } | |
| 94 | |
| 95 // Signature of this field? | |
| 96 ciSymbol* signature() { return _signature; } | |
| 97 | |
| 98 // Of what type is this field? | |
| 99 ciType* type() { return (_type == NULL) ? compute_type() : _type; } | |
| 100 | |
| 101 // How is this field actually stored in memory? | |
| 102 BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; } | |
| 103 | |
| 104 // How big is this field in memory? | |
|
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6633953: type2aelembytes{T_ADDRESS} should be 8 bytes in 64 bit VM
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105 int size_in_bytes() { return type2aelembytes(layout_type()); } |
| 0 | 106 |
| 107 // What is the offset of this field? | |
| 108 int offset() { | |
| 109 assert(_offset >= 1, "illegal call to offset()"); | |
| 110 return _offset; | |
| 111 } | |
| 112 | |
| 113 // Same question, explicit units. (Fields are aligned to the byte level.) | |
| 114 int offset_in_bytes() { | |
| 115 return offset(); | |
| 116 } | |
| 117 | |
| 118 // Is this field shared? | |
| 119 bool is_shared() { | |
| 120 // non-static fields of shared holders are cached | |
| 121 return _holder->is_shared() && !is_static(); | |
| 122 } | |
| 123 | |
| 124 // Is this field a constant? | |
| 125 // | |
| 126 // Clarification: A field is considered constant if: | |
| 127 // 1. The field is both static and final | |
| 128 // 2. The canonical holder of the field has undergone | |
| 129 // static initialization. | |
| 130 // 3. If the field is an object or array, then the oop | |
| 131 // in question is allocated in perm space. | |
| 132 // 4. The field is not one of the special static/final | |
| 133 // non-constant fields. These are java.lang.System.in | |
| 134 // and java.lang.System.out. Abomination. | |
| 135 // | |
| 136 // Note: the check for case 4 is not yet implemented. | |
| 137 bool is_constant() { return _is_constant; } | |
| 138 | |
| 139 // Get the constant value of this field. | |
| 140 ciConstant constant_value() { | |
| 141 assert(is_constant(), "illegal call to constant_value()"); | |
| 142 return _constant_value; | |
| 143 } | |
| 144 | |
| 145 // Check for link time errors. Accessing a field from a | |
| 146 // certain class via a certain bytecode may or may not be legal. | |
| 147 // This call checks to see if an exception may be raised by | |
| 148 // an access of this field. | |
| 149 // | |
| 150 // Usage note: if the same field is accessed multiple times | |
| 151 // in the same compilation, will_link will need to be checked | |
| 152 // at each point of access. | |
| 153 bool will_link(ciInstanceKlass* accessing_klass, | |
| 154 Bytecodes::Code bc); | |
| 155 | |
| 156 // Java access flags | |
| 157 bool is_public () { return flags().is_public(); } | |
| 158 bool is_private () { return flags().is_private(); } | |
| 159 bool is_protected () { return flags().is_protected(); } | |
| 160 bool is_static () { return flags().is_static(); } | |
| 161 bool is_final () { return flags().is_final(); } | |
| 162 bool is_volatile () { return flags().is_volatile(); } | |
| 163 bool is_transient () { return flags().is_transient(); } | |
| 164 | |
| 165 // Debugging output | |
| 166 void print(); | |
| 167 void print_name_on(outputStream* st); | |
| 168 }; |