1 /* 2 * Copyright (c) 2001, 2011, 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, 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 HeapWord* result = NULL; 137 if (UseTLAB) { 138 result = CollectedHeap::allocate_from_tlab(THREAD, size); 139 if (result != NULL) { 140 assert(!HAS_PENDING_EXCEPTION, 141 "Unexpected exception, will result in uninitialized storage"); 142 return result; 143 } 144 } 145 bool gc_overhead_limit_was_exceeded = false; 146 result = Universe::heap()->mem_allocate(size, 147 &gc_overhead_limit_was_exceeded); 148 if (result != NULL) { 149 NOT_PRODUCT(Universe::heap()-> 150 check_for_non_bad_heap_word_value(result, size)); 151 assert(!HAS_PENDING_EXCEPTION, 152 "Unexpected exception, will result in uninitialized storage"); 153 THREAD->incr_allocated_bytes(size * HeapWordSize); 154 return result; 155 } 156 157 158 if (!gc_overhead_limit_was_exceeded) { 159 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 160 report_java_out_of_memory("Java heap space"); 161 162 if (JvmtiExport::should_post_resource_exhausted()) { 163 JvmtiExport::post_resource_exhausted( 164 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, 165 "Java heap space"); 166 } 167 168 THROW_OOP_0(Universe::out_of_memory_error_java_heap()); 169 } else { 170 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 171 report_java_out_of_memory("GC overhead limit exceeded"); 172 173 if (JvmtiExport::should_post_resource_exhausted()) { 174 JvmtiExport::post_resource_exhausted( 175 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP, 176 "GC overhead limit exceeded"); 177 } 178 179 THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit()); 180 } 181 } 182 183 HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, TRAPS) { 184 HeapWord* obj = common_mem_allocate_noinit(size, CHECK_NULL); 185 init_obj(obj, size); 186 return obj; 187 } 188 189 // Need to investigate, do we really want to throw OOM exception here? 190 HeapWord* CollectedHeap::common_permanent_mem_allocate_noinit(size_t size, TRAPS) { 191 if (HAS_PENDING_EXCEPTION) { 192 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending")); 193 return NULL; // caller does a CHECK_NULL too 194 } 195 196 #ifdef ASSERT 197 if (CIFireOOMAt > 0 && THREAD->is_Compiler_thread() && 198 ++_fire_out_of_memory_count >= CIFireOOMAt) { 199 // For testing of OOM handling in the CI throw an OOM and see how 200 // it does. Historically improper handling of these has resulted 201 // in crashes which we really don't want to have in the CI. 202 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); 203 } 204 #endif 205 206 HeapWord* result = Universe::heap()->permanent_mem_allocate(size); 207 if (result != NULL) { 208 NOT_PRODUCT(Universe::heap()-> 209 check_for_non_bad_heap_word_value(result, size)); 210 assert(!HAS_PENDING_EXCEPTION, 211 "Unexpected exception, will result in uninitialized storage"); 212 return result; 213 } 214 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 215 report_java_out_of_memory("PermGen space"); 216 217 if (JvmtiExport::should_post_resource_exhausted()) { 218 JvmtiExport::post_resource_exhausted( 219 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, 220 "PermGen space"); 221 } 222 223 THROW_OOP_0(Universe::out_of_memory_error_perm_gen()); 224 } 225 226 HeapWord* CollectedHeap::common_permanent_mem_allocate_init(size_t size, TRAPS) { 227 HeapWord* obj = common_permanent_mem_allocate_noinit(size, CHECK_NULL); 228 init_obj(obj, size); 229 return obj; 230 } 231 232 HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) { 233 assert(UseTLAB, "should use UseTLAB"); 234 235 HeapWord* obj = thread->tlab().allocate(size); 236 if (obj != NULL) { 237 return obj; 238 } 239 // Otherwise... 240 return allocate_from_tlab_slow(thread, size); 241 } 242 243 void CollectedHeap::init_obj(HeapWord* obj, size_t size) { 244 assert(obj != NULL, "cannot initialize NULL object"); 245 const size_t hs = oopDesc::header_size(); 246 assert(size >= hs, "unexpected object size"); 247 ((oop)obj)->set_klass_gap(0); 248 Copy::fill_to_aligned_words(obj + hs, size - hs); 249 } 250 251 oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) { 252 debug_only(check_for_valid_allocation_state()); 253 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 254 assert(size >= 0, "int won't convert to size_t"); 255 HeapWord* obj = common_mem_allocate_init(size, CHECK_NULL); 256 post_allocation_setup_obj(klass, obj, size); 257 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 258 return (oop)obj; 259 } 260 261 oop CollectedHeap::array_allocate(KlassHandle klass, 262 int size, 263 int length, 264 TRAPS) { 265 debug_only(check_for_valid_allocation_state()); 266 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 267 assert(size >= 0, "int won't convert to size_t"); 268 HeapWord* obj = common_mem_allocate_init(size, CHECK_NULL); 269 post_allocation_setup_array(klass, obj, size, length); 270 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 271 return (oop)obj; 272 } 273 274 oop CollectedHeap::array_allocate_nozero(KlassHandle klass, 275 int size, 276 int length, 277 TRAPS) { 278 debug_only(check_for_valid_allocation_state()); 279 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 280 assert(size >= 0, "int won't convert to size_t"); 281 HeapWord* obj = common_mem_allocate_noinit(size, CHECK_NULL); 282 ((oop)obj)->set_klass_gap(0); 283 post_allocation_setup_array(klass, obj, size, length); 284 #ifndef PRODUCT 285 const size_t hs = oopDesc::header_size()+1; 286 Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs); 287 #endif 288 return (oop)obj; 289 } 290 291 oop CollectedHeap::permanent_obj_allocate(KlassHandle klass, int size, TRAPS) { 292 oop obj = permanent_obj_allocate_no_klass_install(klass, size, CHECK_NULL); 293 post_allocation_install_obj_klass(klass, obj, size); 294 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value((HeapWord*) obj, 295 size)); 296 return obj; 297 } 298 299 oop CollectedHeap::permanent_obj_allocate_no_klass_install(KlassHandle klass, 300 int size, 301 TRAPS) { 302 debug_only(check_for_valid_allocation_state()); 303 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 304 assert(size >= 0, "int won't convert to size_t"); 305 HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL); 306 post_allocation_setup_no_klass_install(klass, obj, size); 307 #ifndef PRODUCT 308 const size_t hs = oopDesc::header_size(); 309 Universe::heap()->check_for_bad_heap_word_value(obj+hs, size-hs); 310 #endif 311 return (oop)obj; 312 } 313 314 oop CollectedHeap::permanent_array_allocate(KlassHandle klass, 315 int size, 316 int length, 317 TRAPS) { 318 debug_only(check_for_valid_allocation_state()); 319 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 320 assert(size >= 0, "int won't convert to size_t"); 321 HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL); 322 post_allocation_setup_array(klass, obj, size, length); 323 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 324 return (oop)obj; 325 } 326 327 // Returns "TRUE" if "p" is a method oop in the 328 // current heap with high probability. NOTE: The main 329 // current consumers of this interface are Forte:: 330 // and ThreadProfiler::. In these cases, the 331 // interpreter frame from which "p" came, may be 332 // under construction when sampled asynchronously, so 333 // the clients want to check that it represents a 334 // valid method before using it. Nonetheless since 335 // the clients do not typically lock out GC, the 336 // predicate is_valid_method() is not stable, so 337 // it is possible that by the time "p" is used, it 338 // is no longer valid. 339 inline bool CollectedHeap::is_valid_method(oop p) const { 340 return 341 p != NULL && 342 343 // Check whether it is aligned at a HeapWord boundary. 344 Space::is_aligned(p) && 345 346 // Check whether "method" is in the allocated part of the 347 // permanent generation -- this needs to be checked before 348 // p->klass() below to avoid a SEGV (but see below 349 // for a potential window of vulnerability). 350 is_permanent((void*)p) && 351 352 // See if GC is active; however, there is still an 353 // apparently unavoidable window after this call 354 // and before the client of this interface uses "p". 355 // If the client chooses not to lock out GC, then 356 // it's a risk the client must accept. 357 !is_gc_active() && 358 359 // Check that p is a methodOop. 360 p->klass() == Universe::methodKlassObj(); 361 } 362 363 364 #ifndef PRODUCT 365 366 inline bool 367 CollectedHeap::promotion_should_fail(volatile size_t* count) { 368 // Access to count is not atomic; the value does not have to be exact. 369 if (PromotionFailureALot) { 370 const size_t gc_num = total_collections(); 371 const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number; 372 if (elapsed_gcs >= PromotionFailureALotInterval) { 373 // Test for unsigned arithmetic wrap-around. 374 if (++*count >= PromotionFailureALotCount) { 375 *count = 0; 376 return true; 377 } 378 } 379 } 380 return false; 381 } 382 383 inline bool CollectedHeap::promotion_should_fail() { 384 return promotion_should_fail(&_promotion_failure_alot_count); 385 } 386 387 inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) { 388 if (PromotionFailureALot) { 389 _promotion_failure_alot_gc_number = total_collections(); 390 *count = 0; 391 } 392 } 393 394 inline void CollectedHeap::reset_promotion_should_fail() { 395 reset_promotion_should_fail(&_promotion_failure_alot_count); 396 } 397 #endif // #ifndef PRODUCT 398 399 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP