Mercurial > hg > truffle
annotate src/share/vm/oops/oop.hpp @ 113:ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
| author | coleenp |
|---|---|
| date | Sun, 13 Apr 2008 17:43:42 -0400 |
| parents | a61af66fc99e |
| children | b7268662a986 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe | |
| 26 // the format of Java objects so the fields can be accessed from C++. | |
| 27 // oopDesc is abstract. | |
| 28 // (see oopHierarchy for complete oop class hierarchy) | |
| 29 // | |
| 30 // no virtual functions allowed | |
| 31 | |
| 32 // store into oop with store check | |
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33 template <class T> void oop_store(T* p, oop v); |
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34 template <class T> void oop_store(volatile T* p, oop v); |
| 0 | 35 |
| 36 // store into oop without store check | |
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37 template <class T> void oop_store_without_check(T* p, oop v); |
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38 template <class T> void oop_store_without_check(volatile T* p, oop v); |
| 0 | 39 |
| 40 | |
| 41 extern bool always_do_update_barrier; | |
| 42 | |
| 43 // Forward declarations. | |
| 44 class OopClosure; | |
| 45 class ScanClosure; | |
| 46 class FastScanClosure; | |
| 47 class FilteringClosure; | |
| 48 class BarrierSet; | |
| 49 class CMSIsAliveClosure; | |
| 50 | |
| 51 class PSPromotionManager; | |
| 52 class ParCompactionManager; | |
| 53 | |
| 54 class oopDesc { | |
| 55 friend class VMStructs; | |
| 56 private: | |
| 57 volatile markOop _mark; | |
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58 union _metadata { |
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59 wideKlassOop _klass; |
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60 narrowOop _compressed_klass; |
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61 } _metadata; |
| 0 | 62 |
| 63 // Fast access to barrier set. Must be initialized. | |
| 64 static BarrierSet* _bs; | |
| 65 | |
| 66 public: | |
| 67 markOop mark() const { return _mark; } | |
| 68 markOop* mark_addr() const { return (markOop*) &_mark; } | |
| 69 | |
| 70 void set_mark(volatile markOop m) { _mark = m; } | |
| 71 | |
| 72 void release_set_mark(markOop m); | |
| 73 markOop cas_set_mark(markOop new_mark, markOop old_mark); | |
| 74 | |
| 75 // Used only to re-initialize the mark word (e.g., of promoted | |
| 76 // objects during a GC) -- requires a valid klass pointer | |
| 77 void init_mark(); | |
| 78 | |
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79 klassOop klass() const; |
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80 oop* klass_addr(); |
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81 narrowOop* compressed_klass_addr(); |
| 0 | 82 |
| 83 void set_klass(klassOop k); | |
| 84 // For when the klass pointer is being used as a linked list "next" field. | |
| 85 void set_klass_to_list_ptr(oop k); | |
| 86 | |
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87 // size of object header, aligned to platform wordSize |
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88 static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
| 0 | 89 |
| 90 Klass* blueprint() const; | |
| 91 | |
| 92 // Returns whether this is an instance of k or an instance of a subclass of k | |
| 93 bool is_a(klassOop k) const; | |
| 94 | |
| 95 // Returns the actual oop size of the object | |
| 96 int size(); | |
| 97 | |
| 98 // Sometimes (for complicated concurrency-related reasons), it is useful | |
| 99 // to be able to figure out the size of an object knowing its klass. | |
| 100 int size_given_klass(Klass* klass); | |
| 101 | |
| 102 // Some perm gen objects are not parseble immediately after | |
| 103 // installation of their klass pointer. | |
| 104 bool is_parsable(); | |
| 105 | |
| 106 // type test operations (inlined in oop.inline.h) | |
| 107 bool is_instance() const; | |
| 108 bool is_instanceRef() const; | |
| 109 bool is_array() const; | |
| 110 bool is_objArray() const; | |
| 111 bool is_symbol() const; | |
| 112 bool is_klass() const; | |
| 113 bool is_thread() const; | |
| 114 bool is_method() const; | |
| 115 bool is_constMethod() const; | |
| 116 bool is_methodData() const; | |
| 117 bool is_constantPool() const; | |
| 118 bool is_constantPoolCache() const; | |
| 119 bool is_typeArray() const; | |
| 120 bool is_javaArray() const; | |
| 121 bool is_compiledICHolder() const; | |
| 122 | |
| 123 private: | |
| 124 // field addresses in oop | |
| 125 void* field_base(int offset) const; | |
| 126 | |
| 127 jbyte* byte_field_addr(int offset) const; | |
| 128 jchar* char_field_addr(int offset) const; | |
| 129 jboolean* bool_field_addr(int offset) const; | |
| 130 jint* int_field_addr(int offset) const; | |
| 131 jshort* short_field_addr(int offset) const; | |
| 132 jlong* long_field_addr(int offset) const; | |
| 133 jfloat* float_field_addr(int offset) const; | |
| 134 jdouble* double_field_addr(int offset) const; | |
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135 address* address_field_addr(int offset) const; |
| 0 | 136 |
| 137 public: | |
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138 // Need this as public for garbage collection. |
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139 template <class T> T* obj_field_addr(int offset) const; |
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140 |
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141 static bool is_null(oop obj); |
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142 static bool is_null(narrowOop obj); |
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143 |
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144 // Decode an oop pointer from a narrowOop if compressed. |
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145 // These are overloaded for oop and narrowOop as are the other functions |
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146 // below so that they can be called in template functions. |
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147 static oop decode_heap_oop_not_null(oop v); |
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148 static oop decode_heap_oop_not_null(narrowOop v); |
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149 static oop decode_heap_oop(oop v); |
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150 static oop decode_heap_oop(narrowOop v); |
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151 |
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152 // Encode an oop pointer to a narrow oop. The or_null versions accept |
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153 // null oop pointer, others do not in order to eliminate the |
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154 // null checking branches. |
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155 static narrowOop encode_heap_oop_not_null(oop v); |
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156 static narrowOop encode_heap_oop(oop v); |
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157 |
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158 // Load an oop out of the Java heap |
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159 static narrowOop load_heap_oop(narrowOop* p); |
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160 static oop load_heap_oop(oop* p); |
| 0 | 161 |
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162 // Load an oop out of Java heap and decode it to an uncompressed oop. |
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163 static oop load_decode_heap_oop_not_null(narrowOop* p); |
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164 static oop load_decode_heap_oop_not_null(oop* p); |
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165 static oop load_decode_heap_oop(narrowOop* p); |
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166 static oop load_decode_heap_oop(oop* p); |
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167 |
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168 // Store an oop into the heap. |
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169 static void store_heap_oop(narrowOop* p, narrowOop v); |
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170 static void store_heap_oop(oop* p, oop v); |
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171 |
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172 // Encode oop if UseCompressedOops and store into the heap. |
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173 static void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
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174 static void encode_store_heap_oop_not_null(oop* p, oop v); |
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175 static void encode_store_heap_oop(narrowOop* p, oop v); |
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176 static void encode_store_heap_oop(oop* p, oop v); |
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177 |
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178 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v); |
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179 static void release_store_heap_oop(volatile oop* p, oop v); |
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180 |
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181 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v); |
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182 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v); |
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183 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v); |
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184 static void release_encode_store_heap_oop(volatile oop* p, oop v); |
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185 |
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186 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest); |
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187 static oop atomic_compare_exchange_oop(oop exchange_value, |
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188 volatile HeapWord *dest, |
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189 oop compare_value); |
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190 |
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191 // Access to fields in a instanceOop through these methods. |
| 0 | 192 oop obj_field(int offset) const; |
| 193 void obj_field_put(int offset, oop value); | |
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194 void obj_field_raw_put(int offset, oop value); |
| 0 | 195 |
| 196 jbyte byte_field(int offset) const; | |
| 197 void byte_field_put(int offset, jbyte contents); | |
| 198 | |
| 199 jchar char_field(int offset) const; | |
| 200 void char_field_put(int offset, jchar contents); | |
| 201 | |
| 202 jboolean bool_field(int offset) const; | |
| 203 void bool_field_put(int offset, jboolean contents); | |
| 204 | |
| 205 jint int_field(int offset) const; | |
| 206 void int_field_put(int offset, jint contents); | |
| 207 | |
| 208 jshort short_field(int offset) const; | |
| 209 void short_field_put(int offset, jshort contents); | |
| 210 | |
| 211 jlong long_field(int offset) const; | |
| 212 void long_field_put(int offset, jlong contents); | |
| 213 | |
| 214 jfloat float_field(int offset) const; | |
| 215 void float_field_put(int offset, jfloat contents); | |
| 216 | |
| 217 jdouble double_field(int offset) const; | |
| 218 void double_field_put(int offset, jdouble contents); | |
| 219 | |
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220 address address_field(int offset) const; |
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221 void address_field_put(int offset, address contents); |
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222 |
| 0 | 223 oop obj_field_acquire(int offset) const; |
| 224 void release_obj_field_put(int offset, oop value); | |
| 225 | |
| 226 jbyte byte_field_acquire(int offset) const; | |
| 227 void release_byte_field_put(int offset, jbyte contents); | |
| 228 | |
| 229 jchar char_field_acquire(int offset) const; | |
| 230 void release_char_field_put(int offset, jchar contents); | |
| 231 | |
| 232 jboolean bool_field_acquire(int offset) const; | |
| 233 void release_bool_field_put(int offset, jboolean contents); | |
| 234 | |
| 235 jint int_field_acquire(int offset) const; | |
| 236 void release_int_field_put(int offset, jint contents); | |
| 237 | |
| 238 jshort short_field_acquire(int offset) const; | |
| 239 void release_short_field_put(int offset, jshort contents); | |
| 240 | |
| 241 jlong long_field_acquire(int offset) const; | |
| 242 void release_long_field_put(int offset, jlong contents); | |
| 243 | |
| 244 jfloat float_field_acquire(int offset) const; | |
| 245 void release_float_field_put(int offset, jfloat contents); | |
| 246 | |
| 247 jdouble double_field_acquire(int offset) const; | |
| 248 void release_double_field_put(int offset, jdouble contents); | |
| 249 | |
| 250 // printing functions for VM debugging | |
| 251 void print_on(outputStream* st) const; // First level print | |
| 252 void print_value_on(outputStream* st) const; // Second level print. | |
| 253 void print_address_on(outputStream* st) const; // Address printing | |
| 254 | |
| 255 // printing on default output stream | |
| 256 void print(); | |
| 257 void print_value(); | |
| 258 void print_address(); | |
| 259 | |
| 260 // return the print strings | |
| 261 char* print_string(); | |
| 262 char* print_value_string(); | |
| 263 | |
| 264 // verification operations | |
| 265 void verify_on(outputStream* st); | |
| 266 void verify(); | |
| 267 void verify_old_oop(oop* p, bool allow_dirty); | |
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268 void verify_old_oop(narrowOop* p, bool allow_dirty); |
| 0 | 269 |
| 270 // tells whether this oop is partially constructed (gc during class loading) | |
| 271 bool partially_loaded(); | |
| 272 void set_partially_loaded(); | |
| 273 | |
| 274 // locking operations | |
| 275 bool is_locked() const; | |
| 276 bool is_unlocked() const; | |
| 277 bool has_bias_pattern() const; | |
| 278 | |
| 279 // asserts | |
| 280 bool is_oop(bool ignore_mark_word = false) const; | |
| 281 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
| 282 #ifndef PRODUCT | |
| 283 bool is_unlocked_oop() const; | |
| 284 #endif | |
| 285 | |
| 286 // garbage collection | |
| 287 bool is_gc_marked() const; | |
| 288 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
| 289 // reference field in "this". | |
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290 void follow_contents(void); |
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291 void follow_header(void); |
| 0 | 292 |
| 293 #ifndef SERIALGC | |
| 294 // Parallel Scavenge | |
| 295 void copy_contents(PSPromotionManager* pm); | |
| 296 void push_contents(PSPromotionManager* pm); | |
| 297 | |
| 298 // Parallel Old | |
| 299 void update_contents(ParCompactionManager* cm); | |
| 300 void update_contents(ParCompactionManager* cm, | |
| 301 HeapWord* begin_limit, | |
| 302 HeapWord* end_limit); | |
| 303 void update_contents(ParCompactionManager* cm, | |
| 304 klassOop old_klass, | |
| 305 HeapWord* begin_limit, | |
| 306 HeapWord* end_limit); | |
| 307 | |
| 308 void follow_contents(ParCompactionManager* cm); | |
| 309 void follow_header(ParCompactionManager* cm); | |
| 310 #endif // SERIALGC | |
| 311 | |
| 312 bool is_perm() const; | |
| 313 bool is_perm_or_null() const; | |
| 314 bool is_shared() const; | |
| 315 bool is_shared_readonly() const; | |
| 316 bool is_shared_readwrite() const; | |
| 317 | |
| 318 // Forward pointer operations for scavenge | |
| 319 bool is_forwarded() const; | |
| 320 | |
| 321 void forward_to(oop p); | |
| 322 bool cas_forward_to(oop p, markOop compare); | |
| 323 | |
| 324 #ifndef SERIALGC | |
| 325 // Like "forward_to", but inserts the forwarding pointer atomically. | |
| 326 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
| 327 // this call returns "NULL" for that thread; any other thread has the | |
| 328 // value of the forwarding pointer returned and does not modify "this". | |
| 329 oop forward_to_atomic(oop p); | |
| 330 #endif // SERIALGC | |
| 331 | |
| 332 oop forwardee() const; | |
| 333 | |
| 334 // Age of object during scavenge | |
| 335 int age() const; | |
| 336 void incr_age(); | |
| 337 | |
| 338 // Adjust all pointers in this object to point at it's forwarded location and | |
| 339 // return the size of this oop. This is used by the MarkSweep collector. | |
| 340 int adjust_pointers(); | |
| 341 void adjust_header(); | |
| 342 | |
| 343 #ifndef SERIALGC | |
| 344 // Parallel old | |
| 345 void update_header(); | |
| 346 void update_header(HeapWord* beg_addr, HeapWord* end_addr); | |
| 347 #endif // SERIALGC | |
| 348 | |
| 349 // mark-sweep support | |
| 350 void follow_body(int begin, int end); | |
| 351 | |
| 352 // Fast access to barrier set | |
| 353 static BarrierSet* bs() { return _bs; } | |
| 354 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
| 355 | |
| 356 // iterators, returns size of object | |
| 357 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
| 358 int oop_iterate(OopClosureType* blk); \ | |
| 359 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
| 360 | |
| 361 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
| 362 ALL_OOP_OOP_ITERATE_CLOSURES_3(OOP_ITERATE_DECL) | |
| 363 | |
| 364 void oop_iterate_header(OopClosure* blk); | |
| 365 void oop_iterate_header(OopClosure* blk, MemRegion mr); | |
| 366 | |
| 367 // identity hash; returns the identity hash key (computes it if necessary) | |
| 368 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
| 369 // safepoint if called on a biased object. Calling code must be aware of that. | |
| 370 intptr_t identity_hash(); | |
| 371 intptr_t slow_identity_hash(); | |
| 372 | |
| 373 // marks are forwarded to stack when object is locked | |
| 374 bool has_displaced_mark() const; | |
| 375 markOop displaced_mark() const; | |
| 376 void set_displaced_mark(markOop m); | |
| 377 | |
| 378 // for code generation | |
| 379 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
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380 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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381 static int klass_gap_offset_in_bytes(); |
| 0 | 382 }; |