Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_interface/collectedHeap.inline.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 | feeb96a45707 37f87013dfd8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2001-2007 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 // Inline allocation implementations. | |
| 26 | |
| 27 void CollectedHeap::post_allocation_setup_common(KlassHandle klass, | |
| 28 HeapWord* obj, | |
| 29 size_t size) { | |
| 30 post_allocation_setup_no_klass_install(klass, obj, size); | |
| 31 post_allocation_install_obj_klass(klass, oop(obj), (int) size); | |
| 32 } | |
| 33 | |
| 34 void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass, | |
| 35 HeapWord* objPtr, | |
| 36 size_t size) { | |
| 37 | |
| 38 oop obj = (oop)objPtr; | |
| 39 | |
| 40 assert(obj != NULL, "NULL object pointer"); | |
| 41 if (UseBiasedLocking && (klass() != NULL)) { | |
| 42 obj->set_mark(klass->prototype_header()); | |
| 43 } else { | |
| 44 // May be bootstrapping | |
| 45 obj->set_mark(markOopDesc::prototype()); | |
| 46 } | |
| 47 | |
| 48 // support low memory notifications (no-op if not enabled) | |
| 49 LowMemoryDetector::detect_low_memory_for_collected_pools(); | |
| 50 } | |
| 51 | |
| 52 void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass, | |
| 53 oop obj, | |
| 54 int size) { | |
| 55 // These asserts are kind of complicated because of klassKlass | |
| 56 // and the beginning of the world. | |
| 57 assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass"); | |
| 58 assert(klass() == NULL || klass()->is_klass(), "not a klass"); | |
| 59 assert(klass() == NULL || klass()->klass_part() != NULL, "not a klass"); | |
| 60 assert(obj != NULL, "NULL object pointer"); | |
| 61 obj->set_klass(klass()); | |
| 62 assert(!Universe::is_fully_initialized() || obj->blueprint() != NULL, | |
| 63 "missing blueprint"); | |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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64 } |
| 0 | 65 |
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66 // Support for jvmti and dtrace |
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67 inline void post_allocation_notify(KlassHandle klass, oop obj) { |
| 0 | 68 // support for JVMTI VMObjectAlloc event (no-op if not enabled) |
| 69 JvmtiExport::vm_object_alloc_event_collector(obj); | |
| 70 | |
| 71 if (DTraceAllocProbes) { | |
| 72 // support for Dtrace object alloc event (no-op most of the time) | |
| 73 if (klass() != NULL && klass()->klass_part()->name() != NULL) { | |
| 74 SharedRuntime::dtrace_object_alloc(obj); | |
| 75 } | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 void CollectedHeap::post_allocation_setup_obj(KlassHandle klass, | |
| 80 HeapWord* obj, | |
| 81 size_t size) { | |
| 82 post_allocation_setup_common(klass, obj, size); | |
| 83 assert(Universe::is_bootstrapping() || | |
| 84 !((oop)obj)->blueprint()->oop_is_array(), "must not be an array"); | |
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85 // notify jvmti and dtrace |
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86 post_allocation_notify(klass, (oop)obj); |
| 0 | 87 } |
| 88 | |
| 89 void CollectedHeap::post_allocation_setup_array(KlassHandle klass, | |
| 90 HeapWord* obj, | |
| 91 size_t size, | |
| 92 int length) { | |
| 93 assert(length >= 0, "length should be non-negative"); | |
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94 post_allocation_setup_common(klass, obj, size); |
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95 // Must set length after installing klass as set_klass zeros the length |
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96 // field in UseCompressedOops |
| 0 | 97 ((arrayOop)obj)->set_length(length); |
| 98 assert(((oop)obj)->blueprint()->oop_is_array(), "must be an array"); | |
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99 // notify jvmti and dtrace (must be after length is set for dtrace) |
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100 post_allocation_notify(klass, (oop)obj); |
| 0 | 101 } |
| 102 | |
| 103 HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, bool is_noref, TRAPS) { | |
| 104 | |
| 105 // Clear unhandled oops for memory allocation. Memory allocation might | |
| 106 // not take out a lock if from tlab, so clear here. | |
| 107 CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();) | |
| 108 | |
| 109 if (HAS_PENDING_EXCEPTION) { | |
| 110 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending")); | |
| 111 return NULL; // caller does a CHECK_0 too | |
| 112 } | |
| 113 | |
| 114 // We may want to update this, is_noref objects might not be allocated in TLABs. | |
| 115 HeapWord* result = NULL; | |
| 116 if (UseTLAB) { | |
| 117 result = CollectedHeap::allocate_from_tlab(THREAD, size); | |
| 118 if (result != NULL) { | |
| 119 assert(!HAS_PENDING_EXCEPTION, | |
| 120 "Unexpected exception, will result in uninitialized storage"); | |
| 121 return result; | |
| 122 } | |
| 123 } | |
| 124 bool gc_overhead_limit_was_exceeded; | |
| 125 result = Universe::heap()->mem_allocate(size, | |
| 126 is_noref, | |
| 127 false, | |
| 128 &gc_overhead_limit_was_exceeded); | |
| 129 if (result != NULL) { | |
| 130 NOT_PRODUCT(Universe::heap()-> | |
| 131 check_for_non_bad_heap_word_value(result, size)); | |
| 132 assert(!HAS_PENDING_EXCEPTION, | |
| 133 "Unexpected exception, will result in uninitialized storage"); | |
| 134 return result; | |
| 135 } | |
| 136 | |
| 137 | |
| 138 if (!gc_overhead_limit_was_exceeded) { | |
| 139 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support | |
| 140 report_java_out_of_memory("Java heap space"); | |
| 141 | |
| 142 if (JvmtiExport::should_post_resource_exhausted()) { | |
| 143 JvmtiExport::post_resource_exhausted( | |
| 144 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, | |
| 145 "Java heap space"); | |
| 146 } | |
| 147 | |
| 148 THROW_OOP_0(Universe::out_of_memory_error_java_heap()); | |
| 149 } else { | |
| 150 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support | |
| 151 report_java_out_of_memory("GC overhead limit exceeded"); | |
| 152 | |
| 153 if (JvmtiExport::should_post_resource_exhausted()) { | |
| 154 JvmtiExport::post_resource_exhausted( | |
| 155 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, | |
| 156 "GC overhead limit exceeded"); | |
| 157 } | |
| 158 | |
| 159 THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit()); | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, bool is_noref, TRAPS) { | |
| 164 HeapWord* obj = common_mem_allocate_noinit(size, is_noref, CHECK_NULL); | |
| 165 init_obj(obj, size); | |
| 166 return obj; | |
| 167 } | |
| 168 | |
| 169 // Need to investigate, do we really want to throw OOM exception here? | |
| 170 HeapWord* CollectedHeap::common_permanent_mem_allocate_noinit(size_t size, TRAPS) { | |
| 171 if (HAS_PENDING_EXCEPTION) { | |
| 172 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending")); | |
| 173 return NULL; // caller does a CHECK_NULL too | |
| 174 } | |
| 175 | |
| 176 #ifdef ASSERT | |
| 177 if (CIFireOOMAt > 0 && THREAD->is_Compiler_thread() && | |
| 178 ++_fire_out_of_memory_count >= CIFireOOMAt) { | |
| 179 // For testing of OOM handling in the CI throw an OOM and see how | |
| 180 // it does. Historically improper handling of these has resulted | |
| 181 // in crashes which we really don't want to have in the CI. | |
| 182 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); | |
| 183 } | |
| 184 #endif | |
| 185 | |
| 186 HeapWord* result = Universe::heap()->permanent_mem_allocate(size); | |
| 187 if (result != NULL) { | |
| 188 NOT_PRODUCT(Universe::heap()-> | |
| 189 check_for_non_bad_heap_word_value(result, size)); | |
| 190 assert(!HAS_PENDING_EXCEPTION, | |
| 191 "Unexpected exception, will result in uninitialized storage"); | |
| 192 return result; | |
| 193 } | |
| 194 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support | |
| 195 report_java_out_of_memory("PermGen space"); | |
| 196 | |
| 197 if (JvmtiExport::should_post_resource_exhausted()) { | |
| 198 JvmtiExport::post_resource_exhausted( | |
| 199 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, | |
| 200 "PermGen space"); | |
| 201 } | |
| 202 | |
| 203 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); | |
| 204 } | |
| 205 | |
| 206 HeapWord* CollectedHeap::common_permanent_mem_allocate_init(size_t size, TRAPS) { | |
| 207 HeapWord* obj = common_permanent_mem_allocate_noinit(size, CHECK_NULL); | |
| 208 init_obj(obj, size); | |
| 209 return obj; | |
| 210 } | |
| 211 | |
| 212 HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) { | |
| 213 assert(UseTLAB, "should use UseTLAB"); | |
| 214 | |
| 215 HeapWord* obj = thread->tlab().allocate(size); | |
| 216 if (obj != NULL) { | |
| 217 return obj; | |
| 218 } | |
| 219 // Otherwise... | |
| 220 return allocate_from_tlab_slow(thread, size); | |
| 221 } | |
| 222 | |
| 223 void CollectedHeap::init_obj(HeapWord* obj, size_t size) { | |
| 224 assert(obj != NULL, "cannot initialize NULL object"); | |
| 225 const size_t hs = oopDesc::header_size(); | |
| 226 assert(size >= hs, "unexpected object size"); | |
| 227 Copy::fill_to_aligned_words(obj + hs, size - hs); | |
| 228 } | |
| 229 | |
| 230 oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) { | |
| 231 debug_only(check_for_valid_allocation_state()); | |
| 232 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
| 233 assert(size >= 0, "int won't convert to size_t"); | |
| 234 HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL); | |
| 235 post_allocation_setup_obj(klass, obj, size); | |
| 236 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); | |
| 237 return (oop)obj; | |
| 238 } | |
| 239 | |
| 240 oop CollectedHeap::array_allocate(KlassHandle klass, | |
| 241 int size, | |
| 242 int length, | |
| 243 TRAPS) { | |
| 244 debug_only(check_for_valid_allocation_state()); | |
| 245 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
| 246 assert(size >= 0, "int won't convert to size_t"); | |
| 247 HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL); | |
| 248 post_allocation_setup_array(klass, obj, size, length); | |
| 249 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); | |
| 250 return (oop)obj; | |
| 251 } | |
| 252 | |
| 253 oop CollectedHeap::large_typearray_allocate(KlassHandle klass, | |
| 254 int size, | |
| 255 int length, | |
| 256 TRAPS) { | |
| 257 debug_only(check_for_valid_allocation_state()); | |
| 258 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
| 259 assert(size >= 0, "int won't convert to size_t"); | |
| 260 HeapWord* obj = common_mem_allocate_init(size, true, CHECK_NULL); | |
| 261 post_allocation_setup_array(klass, obj, size, length); | |
| 262 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); | |
| 263 return (oop)obj; | |
| 264 } | |
| 265 | |
| 266 oop CollectedHeap::permanent_obj_allocate(KlassHandle klass, int size, TRAPS) { | |
| 267 oop obj = permanent_obj_allocate_no_klass_install(klass, size, CHECK_NULL); | |
| 268 post_allocation_install_obj_klass(klass, obj, size); | |
| 269 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value((HeapWord*) obj, | |
| 270 size)); | |
| 271 return obj; | |
| 272 } | |
| 273 | |
| 274 oop CollectedHeap::permanent_obj_allocate_no_klass_install(KlassHandle klass, | |
| 275 int size, | |
| 276 TRAPS) { | |
| 277 debug_only(check_for_valid_allocation_state()); | |
| 278 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
| 279 assert(size >= 0, "int won't convert to size_t"); | |
| 280 HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL); | |
| 281 post_allocation_setup_no_klass_install(klass, obj, size); | |
| 282 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); | |
| 283 return (oop)obj; | |
| 284 } | |
| 285 | |
| 286 oop CollectedHeap::permanent_array_allocate(KlassHandle klass, | |
| 287 int size, | |
| 288 int length, | |
| 289 TRAPS) { | |
| 290 debug_only(check_for_valid_allocation_state()); | |
| 291 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
| 292 assert(size >= 0, "int won't convert to size_t"); | |
| 293 HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL); | |
| 294 post_allocation_setup_array(klass, obj, size, length); | |
| 295 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); | |
| 296 return (oop)obj; | |
| 297 } | |
| 298 | |
| 299 // Returns "TRUE" if "p" is a method oop in the | |
| 300 // current heap with high probability. NOTE: The main | |
| 301 // current consumers of this interface are Forte:: | |
| 302 // and ThreadProfiler::. In these cases, the | |
| 303 // interpreter frame from which "p" came, may be | |
| 304 // under construction when sampled asynchronously, so | |
| 305 // the clients want to check that it represents a | |
| 306 // valid method before using it. Nonetheless since | |
| 307 // the clients do not typically lock out GC, the | |
| 308 // predicate is_valid_method() is not stable, so | |
| 309 // it is possible that by the time "p" is used, it | |
| 310 // is no longer valid. | |
| 311 inline bool CollectedHeap::is_valid_method(oop p) const { | |
| 312 return | |
| 313 p != NULL && | |
| 314 | |
| 315 // Check whether it is aligned at a HeapWord boundary. | |
| 316 Space::is_aligned(p) && | |
| 317 | |
| 318 // Check whether "method" is in the allocated part of the | |
| 319 // permanent generation -- this needs to be checked before | |
| 320 // p->klass() below to avoid a SEGV (but see below | |
| 321 // for a potential window of vulnerability). | |
| 322 is_permanent((void*)p) && | |
| 323 | |
| 324 // See if GC is active; however, there is still an | |
| 325 // apparently unavoidable window after this call | |
| 326 // and before the client of this interface uses "p". | |
| 327 // If the client chooses not to lock out GC, then | |
| 328 // it's a risk the client must accept. | |
| 329 !is_gc_active() && | |
| 330 | |
| 331 // Check that p is a methodOop. | |
| 332 p->klass() == Universe::methodKlassObj(); | |
| 333 } | |
| 334 | |
| 335 | |
| 336 #ifndef PRODUCT | |
| 337 | |
| 338 inline bool | |
| 339 CollectedHeap::promotion_should_fail(volatile size_t* count) { | |
| 340 // Access to count is not atomic; the value does not have to be exact. | |
| 341 if (PromotionFailureALot) { | |
| 342 const size_t gc_num = total_collections(); | |
| 343 const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number; | |
| 344 if (elapsed_gcs >= PromotionFailureALotInterval) { | |
| 345 // Test for unsigned arithmetic wrap-around. | |
| 346 if (++*count >= PromotionFailureALotCount) { | |
| 347 *count = 0; | |
| 348 return true; | |
| 349 } | |
| 350 } | |
| 351 } | |
| 352 return false; | |
| 353 } | |
| 354 | |
| 355 inline bool CollectedHeap::promotion_should_fail() { | |
| 356 return promotion_should_fail(&_promotion_failure_alot_count); | |
| 357 } | |
| 358 | |
| 359 inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) { | |
| 360 if (PromotionFailureALot) { | |
| 361 _promotion_failure_alot_gc_number = total_collections(); | |
| 362 *count = 0; | |
| 363 } | |
| 364 } | |
| 365 | |
| 366 inline void CollectedHeap::reset_promotion_should_fail() { | |
| 367 reset_promotion_should_fail(&_promotion_failure_alot_count); | |
| 368 } | |
| 369 #endif // #ifndef PRODUCT |