1 /* 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 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_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP 26 #define SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP 27 28 #include "gc_interface/collectedHeap.hpp" 29 #include "memory/threadLocalAllocBuffer.inline.hpp" 30 #include "memory/universe.hpp" 31 #include "oops/arrayOop.hpp" 32 #include "prims/jvmtiExport.hpp" 33 #include "runtime/sharedRuntime.hpp" 34 #include "runtime/thread.hpp" 35 #include "services/lowMemoryDetector.hpp" 36 #include "utilities/copy.hpp" 37 #ifdef TARGET_OS_FAMILY_linux 38 # include "thread_linux.inline.hpp" 39 #endif 40 #ifdef TARGET_OS_FAMILY_solaris 41 # include "thread_solaris.inline.hpp" 42 #endif 43 #ifdef TARGET_OS_FAMILY_windows 44 # include "thread_windows.inline.hpp" 45 #endif 46 47 // Inline allocation implementations. 48 49 void CollectedHeap::post_allocation_setup_common(KlassHandle klass, 50 HeapWord* obj, 51 size_t size) { 52 post_allocation_setup_no_klass_install(klass, obj, size); 53 post_allocation_install_obj_klass(klass, oop(obj), (int) size); 54 } 55 56 void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass, 57 HeapWord* objPtr, 58 size_t size) { 59 oop obj = (oop)objPtr; 60 61 assert(obj != NULL, "NULL object pointer"); 62 if (UseBiasedLocking && (klass() != NULL)) { 63 obj->set_mark(klass->prototype_header()); 64 } else { 65 // May be bootstrapping 66 obj->set_mark(markOopDesc::prototype()); 67 } 68 } 69 70 void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass, 71 oop obj, 72 int size) { 73 // These asserts are kind of complicated because of klassKlass 74 // and the beginning of the world. 75 assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass"); 76 assert(klass() == NULL || klass()->is_klass(), "not a klass"); 77 assert(klass() == NULL || klass()->klass_part() != NULL, "not a klass"); 78 assert(obj != NULL, "NULL object pointer"); 79 obj->set_klass(klass()); 80 assert(!Universe::is_fully_initialized() || obj->blueprint() != NULL, 81 "missing blueprint"); 82 } 83 84 // Support for jvmti and dtrace 85 inline void post_allocation_notify(KlassHandle klass, oop obj) { 86 // support low memory notifications (no-op if not enabled) 87 LowMemoryDetector::detect_low_memory_for_collected_pools(); 88 89 // support for JVMTI VMObjectAlloc event (no-op if not enabled) 90 JvmtiExport::vm_object_alloc_event_collector(obj); 91 92 if (DTraceAllocProbes) { 93 // support for Dtrace object alloc event (no-op most of the time) 94 if (klass() != NULL && klass()->klass_part()->name() != NULL) { 95 SharedRuntime::dtrace_object_alloc(obj); 96 } 97 } 98 } 99 100 void CollectedHeap::post_allocation_setup_obj(KlassHandle klass, 101 HeapWord* obj, 102 size_t size) { 103 post_allocation_setup_common(klass, obj, size); 104 assert(Universe::is_bootstrapping() || 105 !((oop)obj)->blueprint()->oop_is_array(), "must not be an array"); 106 // notify jvmti and dtrace 107 post_allocation_notify(klass, (oop)obj); 108 } 109 110 void CollectedHeap::post_allocation_setup_array(KlassHandle klass, 111 HeapWord* obj, 112 size_t size, 113 int length) { 114 // Set array length before setting the _klass field 115 // in post_allocation_setup_common() because the klass field 116 // indicates that the object is parsable by concurrent GC. 117 assert(length >= 0, "length should be non-negative"); 118 ((arrayOop)obj)->set_length(length); 119 post_allocation_setup_common(klass, obj, size); 120 assert(((oop)obj)->blueprint()->oop_is_array(), "must be an array"); 121 // notify jvmti and dtrace (must be after length is set for dtrace) 122 post_allocation_notify(klass, (oop)obj); 123 } 124 125 HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, bool is_noref, TRAPS) { 126 127 // Clear unhandled oops for memory allocation. Memory allocation might 128 // not take out a lock if from tlab, so clear here. 129 CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();) 130 131 if (HAS_PENDING_EXCEPTION) { 132 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending")); 133 return NULL; // caller does a CHECK_0 too 134 } 135 136 // We may want to update this, is_noref objects might not be allocated in TLABs. 137 HeapWord* result = NULL; 138 if (UseTLAB) { 139 result = CollectedHeap::allocate_from_tlab(THREAD, size); 140 if (result != NULL) { 141 assert(!HAS_PENDING_EXCEPTION, 142 "Unexpected exception, will result in uninitialized storage"); 143 return result; 144 } 145 } 146 bool gc_overhead_limit_was_exceeded = false; 147 result = Universe::heap()->mem_allocate(size, 148 is_noref, 149 false, 150 &gc_overhead_limit_was_exceeded); 151 if (result != NULL) { 152 NOT_PRODUCT(Universe::heap()-> 153 check_for_non_bad_heap_word_value(result, size)); 154 assert(!HAS_PENDING_EXCEPTION, 155 "Unexpected exception, will result in uninitialized storage"); 156 return result; 157 } 158 159 160 if (!gc_overhead_limit_was_exceeded) { 161 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 162 report_java_out_of_memory("Java heap space"); 163 164 if (JvmtiExport::should_post_resource_exhausted()) { 165 JvmtiExport::post_resource_exhausted( 166 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, 167 "Java heap space"); 168 } 169 170 THROW_OOP_0(Universe::out_of_memory_error_java_heap()); 171 } else { 172 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 173 report_java_out_of_memory("GC overhead limit exceeded"); 174 175 if (JvmtiExport::should_post_resource_exhausted()) { 176 JvmtiExport::post_resource_exhausted( 177 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, 178 "GC overhead limit exceeded"); 179 } 180 181 THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit()); 182 } 183 } 184 185 HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, bool is_noref, TRAPS) { 186 HeapWord* obj = common_mem_allocate_noinit(size, is_noref, CHECK_NULL); 187 init_obj(obj, size); 188 return obj; 189 } 190 191 // Need to investigate, do we really want to throw OOM exception here? 192 HeapWord* CollectedHeap::common_permanent_mem_allocate_noinit(size_t size, TRAPS) { 193 if (HAS_PENDING_EXCEPTION) { 194 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending")); 195 return NULL; // caller does a CHECK_NULL too 196 } 197 198 #ifdef ASSERT 199 if (CIFireOOMAt > 0 && THREAD->is_Compiler_thread() && 200 ++_fire_out_of_memory_count >= CIFireOOMAt) { 201 // For testing of OOM handling in the CI throw an OOM and see how 202 // it does. Historically improper handling of these has resulted 203 // in crashes which we really don't want to have in the CI. 204 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); 205 } 206 #endif 207 208 HeapWord* result = Universe::heap()->permanent_mem_allocate(size); 209 if (result != NULL) { 210 NOT_PRODUCT(Universe::heap()-> 211 check_for_non_bad_heap_word_value(result, size)); 212 assert(!HAS_PENDING_EXCEPTION, 213 "Unexpected exception, will result in uninitialized storage"); 214 return result; 215 } 216 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 217 report_java_out_of_memory("PermGen space"); 218 219 if (JvmtiExport::should_post_resource_exhausted()) { 220 JvmtiExport::post_resource_exhausted( 221 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, 222 "PermGen space"); 223 } 224 225 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); 226 } 227 228 HeapWord* CollectedHeap::common_permanent_mem_allocate_init(size_t size, TRAPS) { 229 HeapWord* obj = common_permanent_mem_allocate_noinit(size, CHECK_NULL); 230 init_obj(obj, size); 231 return obj; 232 } 233 234 HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) { 235 assert(UseTLAB, "should use UseTLAB"); 236 237 HeapWord* obj = thread->tlab().allocate(size); 238 if (obj != NULL) { 239 return obj; 240 } 241 // Otherwise... 242 return allocate_from_tlab_slow(thread, size); 243 } 244 245 void CollectedHeap::init_obj(HeapWord* obj, size_t size) { 246 assert(obj != NULL, "cannot initialize NULL object"); 247 const size_t hs = oopDesc::header_size(); 248 assert(size >= hs, "unexpected object size"); 249 ((oop)obj)->set_klass_gap(0); 250 Copy::fill_to_aligned_words(obj + hs, size - hs); 251 } 252 253 oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) { 254 debug_only(check_for_valid_allocation_state()); 255 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 256 assert(size >= 0, "int won't convert to size_t"); 257 HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL); 258 post_allocation_setup_obj(klass, obj, size); 259 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 260 return (oop)obj; 261 } 262 263 oop CollectedHeap::array_allocate(KlassHandle klass, 264 int size, 265 int length, 266 TRAPS) { 267 debug_only(check_for_valid_allocation_state()); 268 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 269 assert(size >= 0, "int won't convert to size_t"); 270 HeapWord* obj = common_mem_allocate_init(size, false, CHECK_NULL); 271 post_allocation_setup_array(klass, obj, size, length); 272 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 273 return (oop)obj; 274 } 275 276 oop CollectedHeap::large_typearray_allocate(KlassHandle klass, 277 int size, 278 int length, 279 TRAPS) { 280 debug_only(check_for_valid_allocation_state()); 281 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 282 assert(size >= 0, "int won't convert to size_t"); 283 HeapWord* obj = common_mem_allocate_init(size, true, CHECK_NULL); 284 post_allocation_setup_array(klass, obj, size, length); 285 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 286 return (oop)obj; 287 } 288 289 oop CollectedHeap::permanent_obj_allocate(KlassHandle klass, int size, TRAPS) { 290 oop obj = permanent_obj_allocate_no_klass_install(klass, size, CHECK_NULL); 291 post_allocation_install_obj_klass(klass, obj, size); 292 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value((HeapWord*) obj, 293 size)); 294 return obj; 295 } 296 297 oop CollectedHeap::permanent_obj_allocate_no_klass_install(KlassHandle klass, 298 int size, 299 TRAPS) { 300 debug_only(check_for_valid_allocation_state()); 301 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 302 assert(size >= 0, "int won't convert to size_t"); 303 HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL); 304 post_allocation_setup_no_klass_install(klass, obj, size); 305 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 306 return (oop)obj; 307 } 308 309 oop CollectedHeap::permanent_array_allocate(KlassHandle klass, 310 int size, 311 int length, 312 TRAPS) { 313 debug_only(check_for_valid_allocation_state()); 314 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 315 assert(size >= 0, "int won't convert to size_t"); 316 HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL); 317 post_allocation_setup_array(klass, obj, size, length); 318 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 319 return (oop)obj; 320 } 321 322 // Returns "TRUE" if "p" is a method oop in the 323 // current heap with high probability. NOTE: The main 324 // current consumers of this interface are Forte:: 325 // and ThreadProfiler::. In these cases, the 326 // interpreter frame from which "p" came, may be 327 // under construction when sampled asynchronously, so 328 // the clients want to check that it represents a 329 // valid method before using it. Nonetheless since 330 // the clients do not typically lock out GC, the 331 // predicate is_valid_method() is not stable, so 332 // it is possible that by the time "p" is used, it 333 // is no longer valid. 334 inline bool CollectedHeap::is_valid_method(oop p) const { 335 return 336 p != NULL && 337 338 // Check whether it is aligned at a HeapWord boundary. 339 Space::is_aligned(p) && 340 341 // Check whether "method" is in the allocated part of the 342 // permanent generation -- this needs to be checked before 343 // p->klass() below to avoid a SEGV (but see below 344 // for a potential window of vulnerability). 345 is_permanent((void*)p) && 346 347 // See if GC is active; however, there is still an 348 // apparently unavoidable window after this call 349 // and before the client of this interface uses "p". 350 // If the client chooses not to lock out GC, then 351 // it's a risk the client must accept. 352 !is_gc_active() && 353 354 // Check that p is a methodOop. 355 p->klass() == Universe::methodKlassObj(); 356 } 357 358 359 #ifndef PRODUCT 360 361 inline bool 362 CollectedHeap::promotion_should_fail(volatile size_t* count) { 363 // Access to count is not atomic; the value does not have to be exact. 364 if (PromotionFailureALot) { 365 const size_t gc_num = total_collections(); 366 const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number; 367 if (elapsed_gcs >= PromotionFailureALotInterval) { 368 // Test for unsigned arithmetic wrap-around. 369 if (++*count >= PromotionFailureALotCount) { 370 *count = 0; 371 return true; 372 } 373 } 374 } 375 return false; 376 } 377 378 inline bool CollectedHeap::promotion_should_fail() { 379 return promotion_should_fail(&_promotion_failure_alot_count); 380 } 381 382 inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) { 383 if (PromotionFailureALot) { 384 _promotion_failure_alot_gc_number = total_collections(); 385 *count = 0; 386 } 387 } 388 389 inline void CollectedHeap::reset_promotion_should_fail() { 390 reset_promotion_should_fail(&_promotion_failure_alot_count); 391 } 392 #endif // #ifndef PRODUCT 393 394 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP