1 /* 2 * Copyright (c) 2001, 2015, 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_SHARED_COLLECTEDHEAP_INLINE_HPP 26 #define SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP 27 28 #include "gc/shared/allocTracer.hpp" 29 #include "gc/shared/collectedHeap.hpp" 30 #include "gc/shared/threadLocalAllocBuffer.inline.hpp" 31 #include "memory/universe.hpp" 32 #include "oops/arrayOop.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "runtime/sharedRuntime.hpp" 35 #include "runtime/thread.inline.hpp" 36 #include "services/lowMemoryDetector.hpp" 37 #include "utilities/copy.hpp" 38 39 // Inline allocation implementations. 40 41 void CollectedHeap::post_allocation_setup_common(KlassHandle klass, 42 HeapWord* obj) { 43 post_allocation_setup_no_klass_install(klass, obj); 44 post_allocation_install_obj_klass(klass, oop(obj)); 45 } 46 47 void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass, 48 HeapWord* objPtr) { 49 oop obj = (oop)objPtr; 50 51 assert(obj != NULL, "NULL object pointer"); 52 if (UseBiasedLocking && (klass() != NULL)) { 53 obj->set_mark(klass->prototype_header()); 54 } else { 55 // May be bootstrapping 56 obj->set_mark(markOopDesc::prototype()); 57 } 58 } 59 60 void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass, 61 oop obj) { 62 // These asserts are kind of complicated because of klassKlass 63 // and the beginning of the world. 64 assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass"); 65 assert(klass() == NULL || klass()->is_klass(), "not a klass"); 66 assert(obj != NULL, "NULL object pointer"); 67 obj->set_klass(klass()); 68 assert(!Universe::is_fully_initialized() || obj->klass() != NULL, 69 "missing klass"); 70 } 71 72 // Support for jvmti and dtrace 73 inline void post_allocation_notify(KlassHandle klass, oop obj, int size) { 74 // support low memory notifications (no-op if not enabled) 75 LowMemoryDetector::detect_low_memory_for_collected_pools(); 76 77 // support for JVMTI VMObjectAlloc event (no-op if not enabled) 78 JvmtiExport::vm_object_alloc_event_collector(obj); 79 80 if (DTraceAllocProbes) { 81 // support for Dtrace object alloc event (no-op most of the time) 82 if (klass() != NULL && klass()->name() != NULL) { 83 SharedRuntime::dtrace_object_alloc(obj, size); 84 } 85 } 86 } 87 88 void CollectedHeap::post_allocation_setup_obj(KlassHandle klass, 89 HeapWord* obj, 90 int size) { 91 post_allocation_setup_common(klass, obj); 92 assert(Universe::is_bootstrapping() || 93 !((oop)obj)->is_array(), "must not be an array"); 94 // notify jvmti and dtrace 95 post_allocation_notify(klass, (oop)obj, size); 96 } 97 98 void CollectedHeap::post_allocation_setup_array(KlassHandle klass, 99 HeapWord* obj, 100 int length) { 101 // Set array length before setting the _klass field 102 // in post_allocation_setup_common() because the klass field 103 // indicates that the object is parsable by concurrent GC. 104 assert(length >= 0, "length should be non-negative"); 105 ((arrayOop)obj)->set_length(length); 106 post_allocation_setup_common(klass, obj); 107 oop new_obj = (oop)obj; 108 assert(new_obj->is_array(), "must be an array"); 109 // notify jvmti and dtrace (must be after length is set for dtrace) 110 post_allocation_notify(klass, new_obj, new_obj->size()); 111 } 112 113 HeapWord* CollectedHeap::common_mem_allocate_noinit(KlassHandle klass, size_t size, TRAPS) { 114 115 // Clear unhandled oops for memory allocation. Memory allocation might 116 // not take out a lock if from tlab, so clear here. 117 CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();) 118 119 if (HAS_PENDING_EXCEPTION) { 120 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending")); 121 return NULL; // caller does a CHECK_0 too 122 } 123 124 HeapWord* result = NULL; 125 if (UseTLAB) { 126 result = allocate_from_tlab(klass, THREAD, size); 127 if (result != NULL) { 128 assert(!HAS_PENDING_EXCEPTION, 129 "Unexpected exception, will result in uninitialized storage"); 130 return result; 131 } 132 } 133 bool gc_overhead_limit_was_exceeded = false; 134 result = Universe::heap()->mem_allocate(size, 135 &gc_overhead_limit_was_exceeded); 136 if (result != NULL) { 137 NOT_PRODUCT(Universe::heap()-> 138 check_for_non_bad_heap_word_value(result, size)); 139 assert(!HAS_PENDING_EXCEPTION, 140 "Unexpected exception, will result in uninitialized storage"); 141 THREAD->incr_allocated_bytes(size * HeapWordSize); 142 143 AllocTracer::send_allocation_outside_tlab_event(klass, size * HeapWordSize); 144 145 return result; 146 } 147 148 149 if (!gc_overhead_limit_was_exceeded) { 150 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 151 report_java_out_of_memory("Java heap space"); 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 "Java heap space"); 157 } 158 159 THROW_OOP_0(Universe::out_of_memory_error_java_heap()); 160 } else { 161 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support 162 report_java_out_of_memory("GC overhead limit exceeded"); 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 "GC overhead limit exceeded"); 168 } 169 170 THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit()); 171 } 172 } 173 174 HeapWord* CollectedHeap::common_mem_allocate_init(KlassHandle klass, size_t size, TRAPS) { 175 HeapWord* obj = common_mem_allocate_noinit(klass, size, CHECK_NULL); 176 init_obj(obj, size); 177 return obj; 178 } 179 180 HeapWord* CollectedHeap::allocate_from_tlab(KlassHandle klass, Thread* thread, size_t size) { 181 assert(UseTLAB, "should use UseTLAB"); 182 183 size += Universe::heap()->oop_extra_words(); 184 HeapWord* obj = thread->tlab().allocate(size); 185 if (obj != NULL) { 186 obj = Universe::heap()->tlab_post_allocation_setup(obj); 187 return obj; 188 } 189 // Otherwise... 190 return allocate_from_tlab_slow(klass, thread, size); 191 } 192 193 void CollectedHeap::init_obj(HeapWord* obj, size_t size) { 194 assert(obj != NULL, "cannot initialize NULL object"); 195 const size_t hs = oopDesc::header_size(); 196 assert(size >= hs, "unexpected object size"); 197 ((oop)obj)->set_klass_gap(0); 198 Copy::fill_to_aligned_words(obj + hs, size - hs); 199 } 200 201 oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) { 202 debug_only(check_for_valid_allocation_state()); 203 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 204 assert(size >= 0, "int won't convert to size_t"); 205 HeapWord* obj = common_mem_allocate_init(klass, size, CHECK_NULL); 206 post_allocation_setup_obj(klass, obj, size); 207 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 208 return (oop)obj; 209 } 210 211 oop CollectedHeap::array_allocate(KlassHandle klass, 212 int size, 213 int length, 214 TRAPS) { 215 debug_only(check_for_valid_allocation_state()); 216 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 217 assert(size >= 0, "int won't convert to size_t"); 218 HeapWord* obj = common_mem_allocate_init(klass, size, CHECK_NULL); 219 post_allocation_setup_array(klass, obj, length); 220 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); 221 return (oop)obj; 222 } 223 224 oop CollectedHeap::array_allocate_nozero(KlassHandle klass, 225 int size, 226 int length, 227 TRAPS) { 228 debug_only(check_for_valid_allocation_state()); 229 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); 230 assert(size >= 0, "int won't convert to size_t"); 231 HeapWord* obj = common_mem_allocate_noinit(klass, size, CHECK_NULL); 232 ((oop)obj)->set_klass_gap(0); 233 post_allocation_setup_array(klass, obj, length); 234 #ifndef PRODUCT 235 const size_t hs = oopDesc::header_size()+1; 236 Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs); 237 #endif 238 return (oop)obj; 239 } 240 241 inline HeapWord* CollectedHeap::align_allocation_or_fail(HeapWord* addr, 242 HeapWord* end, 243 unsigned short alignment_in_bytes) { 244 if (alignment_in_bytes <= ObjectAlignmentInBytes) { 245 return addr; 246 } 247 248 assert(is_ptr_aligned(addr, HeapWordSize), 249 err_msg("Address " PTR_FORMAT " is not properly aligned.", p2i(addr))); 250 assert(is_size_aligned(alignment_in_bytes, HeapWordSize), 251 err_msg("Alignment size %u is incorrect.", alignment_in_bytes)); 252 253 HeapWord* new_addr = (HeapWord*) align_pointer_up(addr, alignment_in_bytes); 254 size_t padding = pointer_delta(new_addr, addr); 255 256 if (padding == 0) { 257 return addr; 258 } 259 260 if (padding < CollectedHeap::min_fill_size()) { 261 padding += alignment_in_bytes / HeapWordSize; 262 assert(padding >= CollectedHeap::min_fill_size(), 263 err_msg("alignment_in_bytes %u is expect to be larger " 264 "than the minimum object size", alignment_in_bytes)); 265 new_addr = addr + padding; 266 } 267 268 assert(new_addr > addr, err_msg("Unexpected arithmetic overflow " 269 PTR_FORMAT " not greater than " PTR_FORMAT, p2i(new_addr), p2i(addr))); 270 if(new_addr < end) { 271 CollectedHeap::fill_with_object(addr, padding); 272 return new_addr; 273 } else { 274 return NULL; 275 } 276 } 277 278 #ifndef PRODUCT 279 280 inline bool 281 CollectedHeap::promotion_should_fail(volatile size_t* count) { 282 // Access to count is not atomic; the value does not have to be exact. 283 if (PromotionFailureALot) { 284 const size_t gc_num = total_collections(); 285 const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number; 286 if (elapsed_gcs >= PromotionFailureALotInterval) { 287 // Test for unsigned arithmetic wrap-around. 288 if (++*count >= PromotionFailureALotCount) { 289 *count = 0; 290 return true; 291 } 292 } 293 } 294 return false; 295 } 296 297 inline bool CollectedHeap::promotion_should_fail() { 298 return promotion_should_fail(&_promotion_failure_alot_count); 299 } 300 301 inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) { 302 if (PromotionFailureALot) { 303 _promotion_failure_alot_gc_number = total_collections(); 304 *count = 0; 305 } 306 } 307 308 inline void CollectedHeap::reset_promotion_should_fail() { 309 reset_promotion_should_fail(&_promotion_failure_alot_count); 310 } 311 #endif // #ifndef PRODUCT 312 313 #endif // SHARE_VM_GC_SHARED_COLLECTEDHEAP_INLINE_HPP