Mercurial > hg > truffle
annotate src/share/vm/memory/universe.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 | d1605aabd0a1 |
| 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 // Universe is a name space holding known system classes and objects in the VM. | |
| 26 // | |
| 27 // Loaded classes are accessible through the SystemDictionary. | |
| 28 // | |
| 29 // The object heap is allocated and accessed through Universe, and various allocation | |
| 30 // support is provided. Allocation by the interpreter and compiled code is done inline | |
| 31 // and bails out to Scavenge::invoke_and_allocate. | |
| 32 | |
| 33 class CollectedHeap; | |
| 34 class DeferredObjAllocEvent; | |
| 35 | |
| 36 | |
| 37 // Common parts of a methodOop cache. This cache safely interacts with | |
| 38 // the RedefineClasses API. | |
| 39 // | |
| 40 class CommonMethodOopCache : public CHeapObj { | |
| 41 // We save the klassOop and the idnum of methodOop in order to get | |
| 42 // the current cached methodOop. | |
| 43 private: | |
| 44 klassOop _klass; | |
| 45 int _method_idnum; | |
| 46 | |
| 47 public: | |
| 48 CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; } | |
| 49 ~CommonMethodOopCache() { _klass = NULL; _method_idnum = -1; } | |
| 50 | |
| 51 void init(klassOop k, methodOop m, TRAPS); | |
| 52 klassOop klass() const { return _klass; } | |
| 53 int method_idnum() const { return _method_idnum; } | |
| 54 | |
| 55 // GC support | |
| 56 void oops_do(OopClosure* f) { f->do_oop((oop*)&_klass); } | |
| 57 }; | |
| 58 | |
| 59 | |
| 60 // A helper class for caching a methodOop when the user of the cache | |
| 61 // cares about all versions of the methodOop. | |
| 62 // | |
| 63 class ActiveMethodOopsCache : public CommonMethodOopCache { | |
| 64 // This subclass adds weak references to older versions of the | |
| 65 // methodOop and a query method for a methodOop. | |
| 66 | |
| 67 private: | |
| 68 // If the cached methodOop has not been redefined, then | |
| 69 // _prev_methods will be NULL. If all of the previous | |
| 70 // versions of the method have been collected, then | |
| 71 // _prev_methods can have a length of zero. | |
| 72 GrowableArray<jweak>* _prev_methods; | |
| 73 | |
| 74 public: | |
| 75 ActiveMethodOopsCache() { _prev_methods = NULL; } | |
| 76 ~ActiveMethodOopsCache(); | |
| 77 | |
| 78 void add_previous_version(const methodOop method); | |
| 79 bool is_same_method(const methodOop method) const; | |
| 80 }; | |
| 81 | |
| 82 | |
| 83 // A helper class for caching a methodOop when the user of the cache | |
| 84 // only cares about the latest version of the methodOop. | |
| 85 // | |
| 86 class LatestMethodOopCache : public CommonMethodOopCache { | |
| 87 // This subclass adds a getter method for the latest methodOop. | |
| 88 | |
| 89 public: | |
| 90 methodOop get_methodOop(); | |
| 91 }; | |
| 92 | |
| 93 | |
| 94 class Universe: AllStatic { | |
| 95 friend class MarkSweep; | |
| 96 friend class oopDesc; | |
| 97 friend class ClassLoader; | |
| 98 friend class Arguments; | |
| 99 friend class SystemDictionary; | |
| 100 friend class VMStructs; | |
| 101 friend class CompactingPermGenGen; | |
| 102 friend class VM_PopulateDumpSharedSpace; | |
| 103 | |
| 104 friend jint universe_init(); | |
| 105 friend void universe2_init(); | |
| 106 friend bool universe_post_init(); | |
| 107 | |
| 108 private: | |
| 109 // Known classes in the VM | |
| 110 static klassOop _boolArrayKlassObj; | |
| 111 static klassOop _byteArrayKlassObj; | |
| 112 static klassOop _charArrayKlassObj; | |
| 113 static klassOop _intArrayKlassObj; | |
| 114 static klassOop _shortArrayKlassObj; | |
| 115 static klassOop _longArrayKlassObj; | |
| 116 static klassOop _singleArrayKlassObj; | |
| 117 static klassOop _doubleArrayKlassObj; | |
| 118 static klassOop _typeArrayKlassObjs[T_VOID+1]; | |
| 119 | |
| 120 static klassOop _objectArrayKlassObj; | |
| 121 | |
| 122 static klassOop _symbolKlassObj; | |
| 123 static klassOop _methodKlassObj; | |
| 124 static klassOop _constMethodKlassObj; | |
| 125 static klassOop _methodDataKlassObj; | |
| 126 static klassOop _klassKlassObj; | |
| 127 static klassOop _arrayKlassKlassObj; | |
| 128 static klassOop _objArrayKlassKlassObj; | |
| 129 static klassOop _typeArrayKlassKlassObj; | |
| 130 static klassOop _instanceKlassKlassObj; | |
| 131 static klassOop _constantPoolKlassObj; | |
| 132 static klassOop _constantPoolCacheKlassObj; | |
| 133 static klassOop _compiledICHolderKlassObj; | |
| 134 static klassOop _systemObjArrayKlassObj; | |
| 135 | |
| 136 // Known objects in the VM | |
| 137 | |
| 138 // Primitive objects | |
| 139 static oop _int_mirror; | |
| 140 static oop _float_mirror; | |
| 141 static oop _double_mirror; | |
| 142 static oop _byte_mirror; | |
| 143 static oop _bool_mirror; | |
| 144 static oop _char_mirror; | |
| 145 static oop _long_mirror; | |
| 146 static oop _short_mirror; | |
| 147 static oop _void_mirror; | |
| 148 | |
| 149 static oop _main_thread_group; // Reference to the main thread group object | |
| 150 static oop _system_thread_group; // Reference to the system thread group object | |
| 151 | |
| 152 static typeArrayOop _the_empty_byte_array; // Canonicalized byte array | |
| 153 static typeArrayOop _the_empty_short_array; // Canonicalized short array | |
| 154 static typeArrayOop _the_empty_int_array; // Canonicalized int array | |
| 155 static objArrayOop _the_empty_system_obj_array; // Canonicalized system obj array | |
| 156 static objArrayOop _the_empty_class_klass_array; // Canonicalized obj array of type java.lang.Class | |
| 157 static objArrayOop _the_array_interfaces_array; // Canonicalized 2-array of cloneable & serializable klasses | |
| 158 static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects | |
| 159 static LatestMethodOopCache* _loader_addClass_cache; // method for registering loaded classes in class loader vector | |
| 160 static ActiveMethodOopsCache* _reflect_invoke_cache; // method for security checks | |
| 161 static oop _out_of_memory_error_java_heap; // preallocated error object (no backtrace) | |
| 162 static oop _out_of_memory_error_perm_gen; // preallocated error object (no backtrace) | |
| 163 static oop _out_of_memory_error_array_size;// preallocated error object (no backtrace) | |
| 164 static oop _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace) | |
| 165 | |
| 166 // array of preallocated error objects with backtrace | |
| 167 static objArrayOop _preallocated_out_of_memory_error_array; | |
| 168 | |
| 169 // number of preallocated error objects available for use | |
| 170 static volatile jint _preallocated_out_of_memory_error_avail_count; | |
| 171 | |
| 172 static oop _null_ptr_exception_instance; // preallocated exception object | |
| 173 static oop _arithmetic_exception_instance; // preallocated exception object | |
| 174 static oop _virtual_machine_error_instance; // preallocated exception object | |
| 175 // The object used as an exception dummy when exceptions are thrown for | |
| 176 // the vm thread. | |
| 177 static oop _vm_exception; | |
| 178 | |
| 179 static oop _emptySymbol; // Canonical empty string ("") symbol | |
| 180 | |
| 181 // The particular choice of collected heap. | |
| 182 static CollectedHeap* _collectedHeap; | |
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183 // Base address for oop-within-java-object materialization. |
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184 // NULL if using wide oops. Doubles as heap oop null value. |
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185 static address _heap_base; |
| 0 | 186 |
| 187 // array of dummy objects used with +FullGCAlot | |
| 188 debug_only(static objArrayOop _fullgc_alot_dummy_array;) | |
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189 // index of next entry to clear |
| 0 | 190 debug_only(static int _fullgc_alot_dummy_next;) |
| 191 | |
| 192 // Compiler/dispatch support | |
| 193 static int _base_vtable_size; // Java vtbl size of klass Object (in words) | |
| 194 | |
| 195 // Initialization | |
| 196 static bool _bootstrapping; // true during genesis | |
| 197 static bool _fully_initialized; // true after universe_init and initialize_vtables called | |
| 198 | |
| 199 // the array of preallocated errors with backtraces | |
| 200 static objArrayOop preallocated_out_of_memory_errors() { return _preallocated_out_of_memory_error_array; } | |
| 201 | |
| 202 // generate an out of memory error; if possible using an error with preallocated backtrace; | |
| 203 // otherwise return the given default error. | |
| 204 static oop gen_out_of_memory_error(oop default_err); | |
| 205 | |
| 206 // Historic gc information | |
| 207 static size_t _heap_capacity_at_last_gc; | |
| 208 static size_t _heap_used_at_last_gc; | |
| 209 | |
| 210 static jint initialize_heap(); | |
| 211 static void initialize_basic_type_mirrors(TRAPS); | |
| 212 static void fixup_mirrors(TRAPS); | |
| 213 | |
| 214 static void reinitialize_vtable_of(KlassHandle h_k, TRAPS); | |
| 215 static void reinitialize_itables(TRAPS); | |
| 216 static void compute_base_vtable_size(); // compute vtable size of class Object | |
| 217 | |
| 218 static void genesis(TRAPS); // Create the initial world | |
| 219 | |
| 220 // Mirrors for primitive classes (created eagerly) | |
| 221 static oop check_mirror(oop m) { | |
| 222 assert(m != NULL, "mirror not initialized"); | |
| 223 return m; | |
| 224 } | |
| 225 | |
| 226 // Debugging | |
| 227 static int _verify_count; // number of verifies done | |
| 228 // True during call to verify(). Should only be set/cleared in verify(). | |
| 229 static bool _verify_in_progress; | |
| 230 | |
| 231 static void compute_verify_oop_data(); | |
| 232 | |
| 233 public: | |
| 234 // Known classes in the VM | |
| 235 static klassOop boolArrayKlassObj() { return _boolArrayKlassObj; } | |
| 236 static klassOop byteArrayKlassObj() { return _byteArrayKlassObj; } | |
| 237 static klassOop charArrayKlassObj() { return _charArrayKlassObj; } | |
| 238 static klassOop intArrayKlassObj() { return _intArrayKlassObj; } | |
| 239 static klassOop shortArrayKlassObj() { return _shortArrayKlassObj; } | |
| 240 static klassOop longArrayKlassObj() { return _longArrayKlassObj; } | |
| 241 static klassOop singleArrayKlassObj() { return _singleArrayKlassObj; } | |
| 242 static klassOop doubleArrayKlassObj() { return _doubleArrayKlassObj; } | |
| 243 | |
| 244 static klassOop objectArrayKlassObj() { | |
| 245 return _objectArrayKlassObj; | |
| 246 } | |
| 247 | |
| 248 static klassOop typeArrayKlassObj(BasicType t) { | |
| 249 assert((uint)t < T_VOID+1, "range check"); | |
| 250 assert(_typeArrayKlassObjs[t] != NULL, "domain check"); | |
| 251 return _typeArrayKlassObjs[t]; | |
| 252 } | |
| 253 | |
| 254 static klassOop symbolKlassObj() { return _symbolKlassObj; } | |
| 255 static klassOop methodKlassObj() { return _methodKlassObj; } | |
| 256 static klassOop constMethodKlassObj() { return _constMethodKlassObj; } | |
| 257 static klassOop methodDataKlassObj() { return _methodDataKlassObj; } | |
| 258 static klassOop klassKlassObj() { return _klassKlassObj; } | |
| 259 static klassOop arrayKlassKlassObj() { return _arrayKlassKlassObj; } | |
| 260 static klassOop objArrayKlassKlassObj() { return _objArrayKlassKlassObj; } | |
| 261 static klassOop typeArrayKlassKlassObj() { return _typeArrayKlassKlassObj; } | |
| 262 static klassOop instanceKlassKlassObj() { return _instanceKlassKlassObj; } | |
| 263 static klassOop constantPoolKlassObj() { return _constantPoolKlassObj; } | |
| 264 static klassOop constantPoolCacheKlassObj() { return _constantPoolCacheKlassObj; } | |
| 265 static klassOop compiledICHolderKlassObj() { return _compiledICHolderKlassObj; } | |
| 266 static klassOop systemObjArrayKlassObj() { return _systemObjArrayKlassObj; } | |
| 267 | |
| 268 // Known objects in tbe VM | |
| 269 static oop int_mirror() { return check_mirror(_int_mirror); | |
| 270 } | |
| 271 static oop float_mirror() { return check_mirror(_float_mirror); } | |
| 272 static oop double_mirror() { return check_mirror(_double_mirror); } | |
| 273 static oop byte_mirror() { return check_mirror(_byte_mirror); } | |
| 274 static oop bool_mirror() { return check_mirror(_bool_mirror); } | |
| 275 static oop char_mirror() { return check_mirror(_char_mirror); } | |
| 276 static oop long_mirror() { return check_mirror(_long_mirror); } | |
| 277 static oop short_mirror() { return check_mirror(_short_mirror); } | |
| 278 static oop void_mirror() { return check_mirror(_void_mirror); } | |
| 279 | |
| 280 // table of same | |
| 281 static oop _mirrors[T_VOID+1]; | |
| 282 | |
| 283 static oop java_mirror(BasicType t) { | |
| 284 assert((uint)t < T_VOID+1, "range check"); | |
| 285 return check_mirror(_mirrors[t]); | |
| 286 } | |
| 287 static oop main_thread_group() { return _main_thread_group; } | |
| 288 static void set_main_thread_group(oop group) { _main_thread_group = group;} | |
| 289 | |
| 290 static oop system_thread_group() { return _system_thread_group; } | |
| 291 static void set_system_thread_group(oop group) { _system_thread_group = group;} | |
| 292 | |
| 293 static typeArrayOop the_empty_byte_array() { return _the_empty_byte_array; } | |
| 294 static typeArrayOop the_empty_short_array() { return _the_empty_short_array; } | |
| 295 static typeArrayOop the_empty_int_array() { return _the_empty_int_array; } | |
| 296 static objArrayOop the_empty_system_obj_array () { return _the_empty_system_obj_array; } | |
| 297 static objArrayOop the_empty_class_klass_array () { return _the_empty_class_klass_array; } | |
| 298 static objArrayOop the_array_interfaces_array() { return _the_array_interfaces_array; } | |
| 299 static methodOop finalizer_register_method() { return _finalizer_register_cache->get_methodOop(); } | |
| 300 static methodOop loader_addClass_method() { return _loader_addClass_cache->get_methodOop(); } | |
| 301 static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; } | |
| 302 static oop null_ptr_exception_instance() { return _null_ptr_exception_instance; } | |
| 303 static oop arithmetic_exception_instance() { return _arithmetic_exception_instance; } | |
| 304 static oop virtual_machine_error_instance() { return _virtual_machine_error_instance; } | |
| 305 static oop vm_exception() { return _vm_exception; } | |
| 306 static oop emptySymbol() { return _emptySymbol; } | |
| 307 | |
| 308 // OutOfMemoryError support. Returns an error with the required message. The returned error | |
| 309 // may or may not have a backtrace. If error has a backtrace then the stack trace is already | |
| 310 // filled in. | |
| 311 static oop out_of_memory_error_java_heap() { return gen_out_of_memory_error(_out_of_memory_error_java_heap); } | |
| 312 static oop out_of_memory_error_perm_gen() { return gen_out_of_memory_error(_out_of_memory_error_perm_gen); } | |
| 313 static oop out_of_memory_error_array_size() { return gen_out_of_memory_error(_out_of_memory_error_array_size); } | |
| 314 static oop out_of_memory_error_gc_overhead_limit() { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit); } | |
| 315 | |
| 316 // Accessors needed for fast allocation | |
| 317 static klassOop* boolArrayKlassObj_addr() { return &_boolArrayKlassObj; } | |
| 318 static klassOop* byteArrayKlassObj_addr() { return &_byteArrayKlassObj; } | |
| 319 static klassOop* charArrayKlassObj_addr() { return &_charArrayKlassObj; } | |
| 320 static klassOop* intArrayKlassObj_addr() { return &_intArrayKlassObj; } | |
| 321 static klassOop* shortArrayKlassObj_addr() { return &_shortArrayKlassObj; } | |
| 322 static klassOop* longArrayKlassObj_addr() { return &_longArrayKlassObj; } | |
| 323 static klassOop* singleArrayKlassObj_addr() { return &_singleArrayKlassObj; } | |
| 324 static klassOop* doubleArrayKlassObj_addr() { return &_doubleArrayKlassObj; } | |
| 325 | |
| 326 // The particular choice of collected heap. | |
| 327 static CollectedHeap* heap() { return _collectedHeap; } | |
| 328 | |
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329 // For UseCompressedOops |
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330 static address heap_base() { return _heap_base; } |
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331 static address* heap_base_addr() { return &_heap_base; } |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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332 |
| 0 | 333 // Historic gc information |
| 334 static size_t get_heap_capacity_at_last_gc() { return _heap_capacity_at_last_gc; } | |
| 335 static size_t get_heap_free_at_last_gc() { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; } | |
| 336 static size_t get_heap_used_at_last_gc() { return _heap_used_at_last_gc; } | |
| 337 static void update_heap_info_at_gc(); | |
| 338 | |
| 339 // Testers | |
| 340 static bool is_bootstrapping() { return _bootstrapping; } | |
| 341 static bool is_fully_initialized() { return _fully_initialized; } | |
| 342 | |
| 343 static inline bool element_type_should_be_aligned(BasicType type); | |
| 344 static inline bool field_type_should_be_aligned(BasicType type); | |
| 345 static bool on_page_boundary(void* addr); | |
| 346 static bool should_fill_in_stack_trace(Handle throwable); | |
| 347 static void check_alignment(uintx size, uintx alignment, const char* name); | |
| 348 | |
| 349 // Finalizer support. | |
| 350 static void run_finalizers_on_exit(); | |
| 351 | |
| 352 // Iteration | |
| 353 | |
| 354 // Apply "f" to the addresses of all the direct heap pointers maintained | |
| 355 // as static fields of "Universe". | |
| 356 static void oops_do(OopClosure* f, bool do_all = false); | |
| 357 | |
| 358 // Apply "f" to all klasses for basic types (classes not present in | |
| 359 // SystemDictionary). | |
| 360 static void basic_type_classes_do(void f(klassOop)); | |
| 361 | |
| 362 // Apply "f" to all system klasses (classes not present in SystemDictionary). | |
| 363 static void system_classes_do(void f(klassOop)); | |
| 364 | |
| 365 // For sharing -- fill in a list of known vtable pointers. | |
| 366 static void init_self_patching_vtbl_list(void** list, int count); | |
| 367 | |
| 368 // Debugging | |
| 369 static bool verify_in_progress() { return _verify_in_progress; } | |
| 370 static void verify(bool allow_dirty = true, bool silent = false); | |
| 371 static int verify_count() { return _verify_count; } | |
| 372 static void print(); | |
| 373 static void print_on(outputStream* st); | |
| 374 static void print_heap_at_SIGBREAK(); | |
| 375 static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); } | |
| 376 static void print_heap_after_gc() { print_heap_after_gc(gclog_or_tty); } | |
| 377 static void print_heap_before_gc(outputStream* st); | |
| 378 static void print_heap_after_gc(outputStream* st); | |
| 379 | |
| 380 // Change the number of dummy objects kept reachable by the full gc dummy | |
| 381 // array; this should trigger relocation in a sliding compaction collector. | |
| 382 debug_only(static bool release_fullgc_alot_dummy();) | |
| 383 // The non-oop pattern (see compiledIC.hpp, etc) | |
| 384 static void* non_oop_word(); | |
| 385 | |
| 386 // Oop verification (see MacroAssembler::verify_oop) | |
| 387 static uintptr_t verify_oop_mask() PRODUCT_RETURN0; | |
| 388 static uintptr_t verify_oop_bits() PRODUCT_RETURN0; | |
| 389 static uintptr_t verify_mark_bits() PRODUCT_RETURN0; | |
| 390 static uintptr_t verify_mark_mask() PRODUCT_RETURN0; | |
| 391 static uintptr_t verify_klass_mask() PRODUCT_RETURN0; | |
| 392 static uintptr_t verify_klass_bits() PRODUCT_RETURN0; | |
| 393 | |
| 394 // Flushing and deoptimization | |
| 395 static void flush_dependents_on(instanceKlassHandle dependee); | |
| 396 #ifdef HOTSWAP | |
| 397 // Flushing and deoptimization in case of evolution | |
| 398 static void flush_evol_dependents_on(instanceKlassHandle dependee); | |
| 399 #endif // HOTSWAP | |
| 400 // Support for fullspeed debugging | |
| 401 static void flush_dependents_on_method(methodHandle dependee); | |
| 402 | |
| 403 // Compiler support | |
| 404 static int base_vtable_size() { return _base_vtable_size; } | |
| 405 }; | |
| 406 | |
| 407 class DeferredObjAllocEvent : public CHeapObj { | |
| 408 private: | |
| 409 oop _oop; | |
| 410 size_t _bytesize; | |
| 411 jint _arena_id; | |
| 412 | |
| 413 public: | |
| 414 DeferredObjAllocEvent(const oop o, const size_t s, const jint id) { | |
| 415 _oop = o; | |
| 416 _bytesize = s; | |
| 417 _arena_id = id; | |
| 418 } | |
| 419 | |
| 420 ~DeferredObjAllocEvent() { | |
| 421 } | |
| 422 | |
| 423 jint arena_id() { return _arena_id; } | |
| 424 size_t bytesize() { return _bytesize; } | |
| 425 oop get_oop() { return _oop; } | |
| 426 }; |