Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 1 | /* |
Mikael Vidstedt | a0da47f | 2013-12-24 11:48:39 -0800 | [diff] [blame^] | 2 | * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | * or visit www.oracle.com if you need additional information or have any |
| 21 | * questions. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #ifndef SHARE_VM_OOPS_FIELDINFO_HPP |
| 26 | #define SHARE_VM_OOPS_FIELDINFO_HPP |
| 27 | |
Jon Masamitsu | 5c58d27 | 2012-09-01 13:25:18 -0400 | [diff] [blame] | 28 | #include "oops/constantPool.hpp" |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 29 | #include "oops/typeArrayOop.hpp" |
| 30 | #include "classfile/vmSymbols.hpp" |
| 31 | |
| 32 | // This class represents the field information contained in the fields |
Jon Masamitsu | 5c58d27 | 2012-09-01 13:25:18 -0400 | [diff] [blame] | 33 | // array of an InstanceKlass. Currently it's laid on top an array of |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 34 | // Java shorts but in the future it could simply be used as a real |
| 35 | // array type. FieldInfo generally shouldn't be used directly. |
Jon Masamitsu | 5c58d27 | 2012-09-01 13:25:18 -0400 | [diff] [blame] | 36 | // Fields should be queried either through InstanceKlass or through |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 37 | // the various FieldStreams. |
| 38 | class FieldInfo VALUE_OBJ_CLASS_SPEC { |
| 39 | friend class fieldDescriptor; |
| 40 | friend class JavaFieldStream; |
| 41 | friend class ClassFileParser; |
| 42 | |
| 43 | public: |
| 44 | // fields |
| 45 | // Field info extracted from the class file and stored |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 46 | // as an array of 6 shorts. |
| 47 | |
| 48 | #define FIELDINFO_TAG_SIZE 2 |
| 49 | #define FIELDINFO_TAG_BLANK 0 |
| 50 | #define FIELDINFO_TAG_OFFSET 1 |
| 51 | #define FIELDINFO_TAG_TYPE_PLAIN 2 |
| 52 | #define FIELDINFO_TAG_TYPE_CONTENDED 3 |
| 53 | #define FIELDINFO_TAG_MASK 3 |
| 54 | |
| 55 | // Packed field has the tag, and can be either of: |
| 56 | // hi bits <--------------------------- lo bits |
| 57 | // |---------high---------|---------low---------| |
| 58 | // ..........................................00 - blank |
| 59 | // [------------------offset----------------]01 - real field offset |
| 60 | // ......................[-------type-------]10 - plain field with type |
| 61 | // [--contention_group--][-------type-------]11 - contended field with type and contention group |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 62 | enum FieldOffset { |
| 63 | access_flags_offset = 0, |
| 64 | name_index_offset = 1, |
| 65 | signature_index_offset = 2, |
| 66 | initval_index_offset = 3, |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 67 | low_packed_offset = 4, |
| 68 | high_packed_offset = 5, |
Jiangli Zhou | 31e63d5 | 2012-05-21 14:10:35 -0400 | [diff] [blame] | 69 | field_slots = 6 |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | private: |
| 73 | u2 _shorts[field_slots]; |
| 74 | |
| 75 | void set_name_index(u2 val) { _shorts[name_index_offset] = val; } |
| 76 | void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } |
| 77 | void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 78 | |
| 79 | u2 name_index() const { return _shorts[name_index_offset]; } |
| 80 | u2 signature_index() const { return _shorts[signature_index_offset]; } |
| 81 | u2 initval_index() const { return _shorts[initval_index_offset]; } |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 82 | |
| 83 | public: |
Jon Masamitsu | 5c58d27 | 2012-09-01 13:25:18 -0400 | [diff] [blame] | 84 | static FieldInfo* from_field_array(Array<u2>* fields, int index) { |
| 85 | return ((FieldInfo*)fields->adr_at(index * field_slots)); |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 86 | } |
Jiangli Zhou | 31e63d5 | 2012-05-21 14:10:35 -0400 | [diff] [blame] | 87 | static FieldInfo* from_field_array(u2* fields, int index) { |
| 88 | return ((FieldInfo*)(fields + index * field_slots)); |
| 89 | } |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 90 | |
| 91 | void initialize(u2 access_flags, |
| 92 | u2 name_index, |
| 93 | u2 signature_index, |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 94 | u2 initval_index) { |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 95 | _shorts[access_flags_offset] = access_flags; |
| 96 | _shorts[name_index_offset] = name_index; |
| 97 | _shorts[signature_index_offset] = signature_index; |
| 98 | _shorts[initval_index_offset] = initval_index; |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 99 | _shorts[low_packed_offset] = 0; |
| 100 | _shorts[high_packed_offset] = 0; |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | u2 access_flags() const { return _shorts[access_flags_offset]; } |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 104 | u4 offset() const { |
| 105 | u2 lo = _shorts[low_packed_offset]; |
| 106 | switch(lo & FIELDINFO_TAG_MASK) { |
| 107 | case FIELDINFO_TAG_OFFSET: |
| 108 | return build_int_from_shorts(_shorts[low_packed_offset], _shorts[high_packed_offset]) >> FIELDINFO_TAG_SIZE; |
| 109 | #ifndef PRODUCT |
| 110 | case FIELDINFO_TAG_TYPE_PLAIN: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 111 | fatal("Asking offset for the plain type field"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 112 | case FIELDINFO_TAG_TYPE_CONTENDED: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 113 | fatal("Asking offset for the contended type field"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 114 | case FIELDINFO_TAG_BLANK: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 115 | fatal("Asking offset for the blank field"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 116 | #endif |
| 117 | } |
| 118 | ShouldNotReachHere(); |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | bool is_contended() const { |
| 123 | u2 lo = _shorts[low_packed_offset]; |
| 124 | switch(lo & FIELDINFO_TAG_MASK) { |
| 125 | case FIELDINFO_TAG_TYPE_PLAIN: |
| 126 | return false; |
| 127 | case FIELDINFO_TAG_TYPE_CONTENDED: |
| 128 | return true; |
| 129 | #ifndef PRODUCT |
| 130 | case FIELDINFO_TAG_OFFSET: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 131 | fatal("Asking contended flag for the field with offset"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 132 | case FIELDINFO_TAG_BLANK: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 133 | fatal("Asking contended flag for the blank field"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 134 | #endif |
| 135 | } |
| 136 | ShouldNotReachHere(); |
| 137 | return false; |
| 138 | } |
| 139 | |
| 140 | u2 contended_group() const { |
| 141 | u2 lo = _shorts[low_packed_offset]; |
| 142 | switch(lo & FIELDINFO_TAG_MASK) { |
| 143 | case FIELDINFO_TAG_TYPE_PLAIN: |
| 144 | return 0; |
| 145 | case FIELDINFO_TAG_TYPE_CONTENDED: |
| 146 | return _shorts[high_packed_offset]; |
| 147 | #ifndef PRODUCT |
| 148 | case FIELDINFO_TAG_OFFSET: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 149 | fatal("Asking the contended group for the field with offset"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 150 | case FIELDINFO_TAG_BLANK: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 151 | fatal("Asking the contended group for the blank field"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 152 | #endif |
| 153 | } |
| 154 | ShouldNotReachHere(); |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | u2 allocation_type() const { |
| 159 | u2 lo = _shorts[low_packed_offset]; |
| 160 | switch(lo & FIELDINFO_TAG_MASK) { |
| 161 | case FIELDINFO_TAG_TYPE_PLAIN: |
| 162 | case FIELDINFO_TAG_TYPE_CONTENDED: |
| 163 | return (lo >> FIELDINFO_TAG_SIZE); |
| 164 | #ifndef PRODUCT |
| 165 | case FIELDINFO_TAG_OFFSET: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 166 | fatal("Asking the field type for field with offset"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 167 | case FIELDINFO_TAG_BLANK: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 168 | fatal("Asking the field type for the blank field"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 169 | #endif |
| 170 | } |
| 171 | ShouldNotReachHere(); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | bool is_offset_set() const { |
| 176 | return (_shorts[low_packed_offset] & FIELDINFO_TAG_MASK) == FIELDINFO_TAG_OFFSET; |
| 177 | } |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 178 | |
| 179 | Symbol* name(constantPoolHandle cp) const { |
| 180 | int index = name_index(); |
| 181 | if (is_internal()) { |
| 182 | return lookup_symbol(index); |
| 183 | } |
| 184 | return cp->symbol_at(index); |
| 185 | } |
| 186 | |
| 187 | Symbol* signature(constantPoolHandle cp) const { |
| 188 | int index = signature_index(); |
| 189 | if (is_internal()) { |
| 190 | return lookup_symbol(index); |
| 191 | } |
| 192 | return cp->symbol_at(index); |
| 193 | } |
| 194 | |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 195 | void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } |
| 196 | void set_offset(u4 val) { |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 197 | val = val << FIELDINFO_TAG_SIZE; // make room for tag |
| 198 | _shorts[low_packed_offset] = extract_low_short_from_int(val) | FIELDINFO_TAG_OFFSET; |
| 199 | _shorts[high_packed_offset] = extract_high_short_from_int(val); |
| 200 | } |
| 201 | |
| 202 | void set_allocation_type(int type) { |
| 203 | u2 lo = _shorts[low_packed_offset]; |
| 204 | switch(lo & FIELDINFO_TAG_MASK) { |
| 205 | case FIELDINFO_TAG_BLANK: |
| 206 | _shorts[low_packed_offset] = ((type << FIELDINFO_TAG_SIZE)) & 0xFFFF; |
| 207 | _shorts[low_packed_offset] &= ~FIELDINFO_TAG_MASK; |
| 208 | _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_PLAIN; |
| 209 | return; |
| 210 | #ifndef PRODUCT |
| 211 | case FIELDINFO_TAG_TYPE_PLAIN: |
| 212 | case FIELDINFO_TAG_TYPE_CONTENDED: |
| 213 | case FIELDINFO_TAG_OFFSET: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 214 | fatal("Setting the field type with overwriting"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 215 | #endif |
| 216 | } |
| 217 | ShouldNotReachHere(); |
| 218 | } |
| 219 | |
| 220 | void set_contended_group(u2 val) { |
| 221 | u2 lo = _shorts[low_packed_offset]; |
| 222 | switch(lo & FIELDINFO_TAG_MASK) { |
| 223 | case FIELDINFO_TAG_TYPE_PLAIN: |
| 224 | _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_CONTENDED; |
| 225 | _shorts[high_packed_offset] = val; |
| 226 | return; |
| 227 | #ifndef PRODUCT |
| 228 | case FIELDINFO_TAG_TYPE_CONTENDED: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 229 | fatal("Overwriting contended group"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 230 | case FIELDINFO_TAG_BLANK: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 231 | fatal("Setting contended group for the blank field"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 232 | case FIELDINFO_TAG_OFFSET: |
Niclas Adlertz | e6e6765 | 2013-03-19 10:31:16 +0100 | [diff] [blame] | 233 | fatal("Setting contended group for field with offset"); |
Aleksey Shipilev | 0614ed6 | 2013-01-14 15:17:47 +0100 | [diff] [blame] | 234 | #endif |
| 235 | } |
| 236 | ShouldNotReachHere(); |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | bool is_internal() const { |
| 240 | return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; |
| 241 | } |
| 242 | |
Vladimir Ivanov | f0e77ac | 2013-09-10 14:51:48 -0700 | [diff] [blame] | 243 | bool is_stable() const { |
| 244 | return (access_flags() & JVM_ACC_FIELD_STABLE) != 0; |
| 245 | } |
| 246 | void set_stable(bool z) { |
| 247 | if (z) _shorts[access_flags_offset] |= JVM_ACC_FIELD_STABLE; |
| 248 | else _shorts[access_flags_offset] &= ~JVM_ACC_FIELD_STABLE; |
| 249 | } |
| 250 | |
Tom Rodriguez | e39ba1a | 2011-09-10 17:29:02 -0700 | [diff] [blame] | 251 | Symbol* lookup_symbol(int symbol_index) const { |
| 252 | assert(is_internal(), "only internal fields"); |
| 253 | return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); |
| 254 | } |
| 255 | }; |
| 256 | |
| 257 | #endif // SHARE_VM_OOPS_FIELDINFO_HPP |