Tue, 15 Nov 2011 20:17:33 +0100
7110152: assert(size_in_words <= (julong)max_jint) failed: no overflow
Summary: Reduce what arrayOopDesc::max_array_length() returns to avoid int overflow
Reviewed-by: kvn, dholmes, tonyp
duke@435 | 1 | /* |
stefank@2534 | 2 | * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_OOPS_OOP_HPP |
stefank@2314 | 26 | #define SHARE_VM_OOPS_OOP_HPP |
stefank@2314 | 27 | |
stefank@2314 | 28 | #include "memory/iterator.hpp" |
stefank@2314 | 29 | #include "memory/memRegion.hpp" |
stefank@2314 | 30 | #include "memory/specialized_oop_closures.hpp" |
stefank@2314 | 31 | #include "utilities/top.hpp" |
stefank@2314 | 32 | |
duke@435 | 33 | // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe |
duke@435 | 34 | // the format of Java objects so the fields can be accessed from C++. |
duke@435 | 35 | // oopDesc is abstract. |
duke@435 | 36 | // (see oopHierarchy for complete oop class hierarchy) |
duke@435 | 37 | // |
duke@435 | 38 | // no virtual functions allowed |
duke@435 | 39 | |
duke@435 | 40 | // store into oop with store check |
stefank@2314 | 41 | template <class T> void oop_store(T* p, oop v); |
stefank@2314 | 42 | template <class T> void oop_store(volatile T* p, oop v); |
duke@435 | 43 | |
duke@435 | 44 | // store into oop without store check |
stefank@2314 | 45 | template <class T> void oop_store_without_check(T* p, oop v); |
stefank@2314 | 46 | template <class T> void oop_store_without_check(volatile T* p, oop v); |
duke@435 | 47 | |
duke@435 | 48 | extern bool always_do_update_barrier; |
duke@435 | 49 | |
duke@435 | 50 | // Forward declarations. |
duke@435 | 51 | class OopClosure; |
duke@435 | 52 | class ScanClosure; |
duke@435 | 53 | class FastScanClosure; |
duke@435 | 54 | class FilteringClosure; |
duke@435 | 55 | class BarrierSet; |
duke@435 | 56 | class CMSIsAliveClosure; |
duke@435 | 57 | |
duke@435 | 58 | class PSPromotionManager; |
duke@435 | 59 | class ParCompactionManager; |
duke@435 | 60 | |
duke@435 | 61 | class oopDesc { |
duke@435 | 62 | friend class VMStructs; |
duke@435 | 63 | private: |
duke@435 | 64 | volatile markOop _mark; |
coleenp@548 | 65 | union _metadata { |
coleenp@548 | 66 | wideKlassOop _klass; |
coleenp@548 | 67 | narrowOop _compressed_klass; |
coleenp@548 | 68 | } _metadata; |
duke@435 | 69 | |
duke@435 | 70 | // Fast access to barrier set. Must be initialized. |
duke@435 | 71 | static BarrierSet* _bs; |
duke@435 | 72 | |
duke@435 | 73 | public: |
ysr@2533 | 74 | enum ConcSafeType { |
ysr@2533 | 75 | IsUnsafeConc = false, |
ysr@2533 | 76 | IsSafeConc = true |
ysr@2533 | 77 | }; |
ysr@2533 | 78 | |
duke@435 | 79 | markOop mark() const { return _mark; } |
duke@435 | 80 | markOop* mark_addr() const { return (markOop*) &_mark; } |
duke@435 | 81 | |
duke@435 | 82 | void set_mark(volatile markOop m) { _mark = m; } |
duke@435 | 83 | |
duke@435 | 84 | void release_set_mark(markOop m); |
duke@435 | 85 | markOop cas_set_mark(markOop new_mark, markOop old_mark); |
duke@435 | 86 | |
duke@435 | 87 | // Used only to re-initialize the mark word (e.g., of promoted |
duke@435 | 88 | // objects during a GC) -- requires a valid klass pointer |
duke@435 | 89 | void init_mark(); |
duke@435 | 90 | |
coleenp@548 | 91 | klassOop klass() const; |
coleenp@602 | 92 | klassOop klass_or_null() const volatile; |
coleenp@548 | 93 | oop* klass_addr(); |
coleenp@548 | 94 | narrowOop* compressed_klass_addr(); |
duke@435 | 95 | |
duke@435 | 96 | void set_klass(klassOop k); |
coleenp@602 | 97 | |
coleenp@602 | 98 | // For klass field compression |
coleenp@602 | 99 | int klass_gap() const; |
coleenp@602 | 100 | void set_klass_gap(int z); |
duke@435 | 101 | // For when the klass pointer is being used as a linked list "next" field. |
duke@435 | 102 | void set_klass_to_list_ptr(oop k); |
duke@435 | 103 | |
coleenp@548 | 104 | // size of object header, aligned to platform wordSize |
coleenp@548 | 105 | static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
duke@435 | 106 | |
duke@435 | 107 | Klass* blueprint() const; |
duke@435 | 108 | |
duke@435 | 109 | // Returns whether this is an instance of k or an instance of a subclass of k |
duke@435 | 110 | bool is_a(klassOop k) const; |
duke@435 | 111 | |
duke@435 | 112 | // Returns the actual oop size of the object |
duke@435 | 113 | int size(); |
duke@435 | 114 | |
duke@435 | 115 | // Sometimes (for complicated concurrency-related reasons), it is useful |
duke@435 | 116 | // to be able to figure out the size of an object knowing its klass. |
duke@435 | 117 | int size_given_klass(Klass* klass); |
duke@435 | 118 | |
duke@435 | 119 | // Some perm gen objects are not parseble immediately after |
duke@435 | 120 | // installation of their klass pointer. |
duke@435 | 121 | bool is_parsable(); |
duke@435 | 122 | |
jmasa@953 | 123 | // Some perm gen objects that have been allocated and initialized |
jmasa@953 | 124 | // can be changed by the VM when not at a safe point (class rededfinition |
jmasa@953 | 125 | // is an example). Such objects should not be examined by the |
jmasa@953 | 126 | // concurrent processing of a garbage collector if is_conc_safe() |
jmasa@953 | 127 | // returns false. |
jmasa@953 | 128 | bool is_conc_safe(); |
jmasa@953 | 129 | |
duke@435 | 130 | // type test operations (inlined in oop.inline.h) |
duke@435 | 131 | bool is_instance() const; |
never@2658 | 132 | bool is_instanceMirror() const; |
duke@435 | 133 | bool is_instanceRef() const; |
duke@435 | 134 | bool is_array() const; |
duke@435 | 135 | bool is_objArray() const; |
duke@435 | 136 | bool is_klass() const; |
duke@435 | 137 | bool is_thread() const; |
duke@435 | 138 | bool is_method() const; |
duke@435 | 139 | bool is_constMethod() const; |
duke@435 | 140 | bool is_methodData() const; |
duke@435 | 141 | bool is_constantPool() const; |
duke@435 | 142 | bool is_constantPoolCache() const; |
duke@435 | 143 | bool is_typeArray() const; |
duke@435 | 144 | bool is_javaArray() const; |
duke@435 | 145 | bool is_compiledICHolder() const; |
duke@435 | 146 | |
duke@435 | 147 | private: |
duke@435 | 148 | // field addresses in oop |
duke@435 | 149 | void* field_base(int offset) const; |
duke@435 | 150 | |
duke@435 | 151 | jbyte* byte_field_addr(int offset) const; |
duke@435 | 152 | jchar* char_field_addr(int offset) const; |
duke@435 | 153 | jboolean* bool_field_addr(int offset) const; |
duke@435 | 154 | jint* int_field_addr(int offset) const; |
duke@435 | 155 | jshort* short_field_addr(int offset) const; |
duke@435 | 156 | jlong* long_field_addr(int offset) const; |
duke@435 | 157 | jfloat* float_field_addr(int offset) const; |
duke@435 | 158 | jdouble* double_field_addr(int offset) const; |
coleenp@548 | 159 | address* address_field_addr(int offset) const; |
duke@435 | 160 | |
duke@435 | 161 | public: |
coleenp@548 | 162 | // Need this as public for garbage collection. |
coleenp@548 | 163 | template <class T> T* obj_field_addr(int offset) const; |
duke@435 | 164 | |
coleenp@548 | 165 | static bool is_null(oop obj); |
coleenp@548 | 166 | static bool is_null(narrowOop obj); |
coleenp@548 | 167 | |
coleenp@548 | 168 | // Decode an oop pointer from a narrowOop if compressed. |
coleenp@548 | 169 | // These are overloaded for oop and narrowOop as are the other functions |
coleenp@548 | 170 | // below so that they can be called in template functions. |
coleenp@548 | 171 | static oop decode_heap_oop_not_null(oop v); |
coleenp@548 | 172 | static oop decode_heap_oop_not_null(narrowOop v); |
coleenp@548 | 173 | static oop decode_heap_oop(oop v); |
coleenp@548 | 174 | static oop decode_heap_oop(narrowOop v); |
coleenp@548 | 175 | |
coleenp@548 | 176 | // Encode an oop pointer to a narrow oop. The or_null versions accept |
coleenp@548 | 177 | // null oop pointer, others do not in order to eliminate the |
coleenp@548 | 178 | // null checking branches. |
coleenp@548 | 179 | static narrowOop encode_heap_oop_not_null(oop v); |
coleenp@548 | 180 | static narrowOop encode_heap_oop(oop v); |
coleenp@548 | 181 | |
coleenp@548 | 182 | // Load an oop out of the Java heap |
coleenp@548 | 183 | static narrowOop load_heap_oop(narrowOop* p); |
coleenp@548 | 184 | static oop load_heap_oop(oop* p); |
coleenp@548 | 185 | |
coleenp@548 | 186 | // Load an oop out of Java heap and decode it to an uncompressed oop. |
coleenp@548 | 187 | static oop load_decode_heap_oop_not_null(narrowOop* p); |
coleenp@548 | 188 | static oop load_decode_heap_oop_not_null(oop* p); |
coleenp@548 | 189 | static oop load_decode_heap_oop(narrowOop* p); |
coleenp@548 | 190 | static oop load_decode_heap_oop(oop* p); |
coleenp@548 | 191 | |
coleenp@548 | 192 | // Store an oop into the heap. |
coleenp@548 | 193 | static void store_heap_oop(narrowOop* p, narrowOop v); |
coleenp@548 | 194 | static void store_heap_oop(oop* p, oop v); |
coleenp@548 | 195 | |
coleenp@548 | 196 | // Encode oop if UseCompressedOops and store into the heap. |
coleenp@548 | 197 | static void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
coleenp@548 | 198 | static void encode_store_heap_oop_not_null(oop* p, oop v); |
coleenp@548 | 199 | static void encode_store_heap_oop(narrowOop* p, oop v); |
coleenp@548 | 200 | static void encode_store_heap_oop(oop* p, oop v); |
coleenp@548 | 201 | |
coleenp@548 | 202 | static void release_store_heap_oop(volatile narrowOop* p, narrowOop v); |
coleenp@548 | 203 | static void release_store_heap_oop(volatile oop* p, oop v); |
coleenp@548 | 204 | |
coleenp@548 | 205 | static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v); |
coleenp@548 | 206 | static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v); |
coleenp@548 | 207 | static void release_encode_store_heap_oop(volatile narrowOop* p, oop v); |
coleenp@548 | 208 | static void release_encode_store_heap_oop(volatile oop* p, oop v); |
coleenp@548 | 209 | |
coleenp@548 | 210 | static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest); |
coleenp@548 | 211 | static oop atomic_compare_exchange_oop(oop exchange_value, |
coleenp@548 | 212 | volatile HeapWord *dest, |
coleenp@548 | 213 | oop compare_value); |
coleenp@548 | 214 | |
coleenp@548 | 215 | // Access to fields in a instanceOop through these methods. |
duke@435 | 216 | oop obj_field(int offset) const; |
twisti@3131 | 217 | volatile oop obj_field_volatile(int offset) const; |
duke@435 | 218 | void obj_field_put(int offset, oop value); |
twisti@3131 | 219 | void obj_field_put_raw(int offset, oop value); |
twisti@3131 | 220 | void obj_field_put_volatile(int offset, oop value); |
duke@435 | 221 | |
duke@435 | 222 | jbyte byte_field(int offset) const; |
duke@435 | 223 | void byte_field_put(int offset, jbyte contents); |
duke@435 | 224 | |
duke@435 | 225 | jchar char_field(int offset) const; |
duke@435 | 226 | void char_field_put(int offset, jchar contents); |
duke@435 | 227 | |
duke@435 | 228 | jboolean bool_field(int offset) const; |
duke@435 | 229 | void bool_field_put(int offset, jboolean contents); |
duke@435 | 230 | |
duke@435 | 231 | jint int_field(int offset) const; |
duke@435 | 232 | void int_field_put(int offset, jint contents); |
duke@435 | 233 | |
duke@435 | 234 | jshort short_field(int offset) const; |
duke@435 | 235 | void short_field_put(int offset, jshort contents); |
duke@435 | 236 | |
duke@435 | 237 | jlong long_field(int offset) const; |
duke@435 | 238 | void long_field_put(int offset, jlong contents); |
duke@435 | 239 | |
duke@435 | 240 | jfloat float_field(int offset) const; |
duke@435 | 241 | void float_field_put(int offset, jfloat contents); |
duke@435 | 242 | |
duke@435 | 243 | jdouble double_field(int offset) const; |
duke@435 | 244 | void double_field_put(int offset, jdouble contents); |
duke@435 | 245 | |
coleenp@548 | 246 | address address_field(int offset) const; |
coleenp@548 | 247 | void address_field_put(int offset, address contents); |
coleenp@548 | 248 | |
duke@435 | 249 | oop obj_field_acquire(int offset) const; |
duke@435 | 250 | void release_obj_field_put(int offset, oop value); |
duke@435 | 251 | |
duke@435 | 252 | jbyte byte_field_acquire(int offset) const; |
duke@435 | 253 | void release_byte_field_put(int offset, jbyte contents); |
duke@435 | 254 | |
duke@435 | 255 | jchar char_field_acquire(int offset) const; |
duke@435 | 256 | void release_char_field_put(int offset, jchar contents); |
duke@435 | 257 | |
duke@435 | 258 | jboolean bool_field_acquire(int offset) const; |
duke@435 | 259 | void release_bool_field_put(int offset, jboolean contents); |
duke@435 | 260 | |
duke@435 | 261 | jint int_field_acquire(int offset) const; |
duke@435 | 262 | void release_int_field_put(int offset, jint contents); |
duke@435 | 263 | |
duke@435 | 264 | jshort short_field_acquire(int offset) const; |
duke@435 | 265 | void release_short_field_put(int offset, jshort contents); |
duke@435 | 266 | |
duke@435 | 267 | jlong long_field_acquire(int offset) const; |
duke@435 | 268 | void release_long_field_put(int offset, jlong contents); |
duke@435 | 269 | |
duke@435 | 270 | jfloat float_field_acquire(int offset) const; |
duke@435 | 271 | void release_float_field_put(int offset, jfloat contents); |
duke@435 | 272 | |
duke@435 | 273 | jdouble double_field_acquire(int offset) const; |
duke@435 | 274 | void release_double_field_put(int offset, jdouble contents); |
duke@435 | 275 | |
jrose@1145 | 276 | address address_field_acquire(int offset) const; |
jrose@1145 | 277 | void release_address_field_put(int offset, address contents); |
jrose@1145 | 278 | |
duke@435 | 279 | // printing functions for VM debugging |
duke@435 | 280 | void print_on(outputStream* st) const; // First level print |
duke@435 | 281 | void print_value_on(outputStream* st) const; // Second level print. |
duke@435 | 282 | void print_address_on(outputStream* st) const; // Address printing |
duke@435 | 283 | |
duke@435 | 284 | // printing on default output stream |
duke@435 | 285 | void print(); |
duke@435 | 286 | void print_value(); |
duke@435 | 287 | void print_address(); |
duke@435 | 288 | |
duke@435 | 289 | // return the print strings |
duke@435 | 290 | char* print_string(); |
duke@435 | 291 | char* print_value_string(); |
duke@435 | 292 | |
duke@435 | 293 | // verification operations |
duke@435 | 294 | void verify_on(outputStream* st); |
duke@435 | 295 | void verify(); |
duke@435 | 296 | void verify_old_oop(oop* p, bool allow_dirty); |
coleenp@548 | 297 | void verify_old_oop(narrowOop* p, bool allow_dirty); |
duke@435 | 298 | |
duke@435 | 299 | // tells whether this oop is partially constructed (gc during class loading) |
duke@435 | 300 | bool partially_loaded(); |
duke@435 | 301 | void set_partially_loaded(); |
duke@435 | 302 | |
duke@435 | 303 | // locking operations |
duke@435 | 304 | bool is_locked() const; |
duke@435 | 305 | bool is_unlocked() const; |
duke@435 | 306 | bool has_bias_pattern() const; |
duke@435 | 307 | |
duke@435 | 308 | // asserts |
duke@435 | 309 | bool is_oop(bool ignore_mark_word = false) const; |
duke@435 | 310 | bool is_oop_or_null(bool ignore_mark_word = false) const; |
duke@435 | 311 | #ifndef PRODUCT |
duke@435 | 312 | bool is_unlocked_oop() const; |
duke@435 | 313 | #endif |
duke@435 | 314 | |
duke@435 | 315 | // garbage collection |
duke@435 | 316 | bool is_gc_marked() const; |
duke@435 | 317 | // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL |
duke@435 | 318 | // reference field in "this". |
coleenp@548 | 319 | void follow_contents(void); |
coleenp@548 | 320 | void follow_header(void); |
duke@435 | 321 | |
duke@435 | 322 | #ifndef SERIALGC |
duke@435 | 323 | // Parallel Scavenge |
duke@435 | 324 | void push_contents(PSPromotionManager* pm); |
duke@435 | 325 | |
duke@435 | 326 | // Parallel Old |
duke@435 | 327 | void update_contents(ParCompactionManager* cm); |
duke@435 | 328 | |
duke@435 | 329 | void follow_contents(ParCompactionManager* cm); |
duke@435 | 330 | void follow_header(ParCompactionManager* cm); |
duke@435 | 331 | #endif // SERIALGC |
duke@435 | 332 | |
duke@435 | 333 | bool is_perm() const; |
duke@435 | 334 | bool is_perm_or_null() const; |
jrose@1424 | 335 | bool is_scavengable() const; |
duke@435 | 336 | bool is_shared() const; |
duke@435 | 337 | bool is_shared_readonly() const; |
duke@435 | 338 | bool is_shared_readwrite() const; |
duke@435 | 339 | |
duke@435 | 340 | // Forward pointer operations for scavenge |
duke@435 | 341 | bool is_forwarded() const; |
duke@435 | 342 | |
duke@435 | 343 | void forward_to(oop p); |
duke@435 | 344 | bool cas_forward_to(oop p, markOop compare); |
duke@435 | 345 | |
duke@435 | 346 | #ifndef SERIALGC |
duke@435 | 347 | // Like "forward_to", but inserts the forwarding pointer atomically. |
duke@435 | 348 | // Exactly one thread succeeds in inserting the forwarding pointer, and |
duke@435 | 349 | // this call returns "NULL" for that thread; any other thread has the |
duke@435 | 350 | // value of the forwarding pointer returned and does not modify "this". |
duke@435 | 351 | oop forward_to_atomic(oop p); |
duke@435 | 352 | #endif // SERIALGC |
duke@435 | 353 | |
duke@435 | 354 | oop forwardee() const; |
duke@435 | 355 | |
duke@435 | 356 | // Age of object during scavenge |
duke@435 | 357 | int age() const; |
duke@435 | 358 | void incr_age(); |
duke@435 | 359 | |
duke@435 | 360 | // Adjust all pointers in this object to point at it's forwarded location and |
duke@435 | 361 | // return the size of this oop. This is used by the MarkSweep collector. |
duke@435 | 362 | int adjust_pointers(); |
duke@435 | 363 | void adjust_header(); |
duke@435 | 364 | |
duke@435 | 365 | #ifndef SERIALGC |
duke@435 | 366 | // Parallel old |
duke@435 | 367 | void update_header(); |
duke@435 | 368 | #endif // SERIALGC |
duke@435 | 369 | |
duke@435 | 370 | // mark-sweep support |
duke@435 | 371 | void follow_body(int begin, int end); |
duke@435 | 372 | |
duke@435 | 373 | // Fast access to barrier set |
duke@435 | 374 | static BarrierSet* bs() { return _bs; } |
duke@435 | 375 | static void set_bs(BarrierSet* bs) { _bs = bs; } |
duke@435 | 376 | |
duke@435 | 377 | // iterators, returns size of object |
ysr@777 | 378 | #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
duke@435 | 379 | int oop_iterate(OopClosureType* blk); \ |
duke@435 | 380 | int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. |
duke@435 | 381 | |
duke@435 | 382 | ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) |
ysr@777 | 383 | ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
ysr@777 | 384 | |
ysr@777 | 385 | #ifndef SERIALGC |
ysr@777 | 386 | |
ysr@777 | 387 | #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
ysr@777 | 388 | int oop_iterate_backwards(OopClosureType* blk); |
ysr@777 | 389 | |
ysr@777 | 390 | ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
ysr@777 | 391 | ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
ysr@777 | 392 | #endif |
duke@435 | 393 | |
duke@435 | 394 | void oop_iterate_header(OopClosure* blk); |
duke@435 | 395 | void oop_iterate_header(OopClosure* blk, MemRegion mr); |
duke@435 | 396 | |
duke@435 | 397 | // identity hash; returns the identity hash key (computes it if necessary) |
duke@435 | 398 | // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a |
duke@435 | 399 | // safepoint if called on a biased object. Calling code must be aware of that. |
duke@435 | 400 | intptr_t identity_hash(); |
duke@435 | 401 | intptr_t slow_identity_hash(); |
duke@435 | 402 | |
duke@435 | 403 | // marks are forwarded to stack when object is locked |
duke@435 | 404 | bool has_displaced_mark() const; |
duke@435 | 405 | markOop displaced_mark() const; |
duke@435 | 406 | void set_displaced_mark(markOop m); |
duke@435 | 407 | |
duke@435 | 408 | // for code generation |
duke@435 | 409 | static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } |
coleenp@548 | 410 | static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
coleenp@548 | 411 | static int klass_gap_offset_in_bytes(); |
duke@435 | 412 | }; |
stefank@2314 | 413 | |
stefank@2314 | 414 | #endif // SHARE_VM_OOPS_OOP_HPP |