1 /*
2 * Copyright (c) 2001, 2012, 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/allocTracer.hpp"
29 #include "gc_interface/collectedHeap.hpp"
30 #include "memory/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) {
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);
84 }
85 }
86 }
87
88 void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,
89 HeapWord* obj) {
90 post_allocation_setup_common(klass, obj);
91 assert(Universe::is_bootstrapping() ||
92 !((oop)obj)->is_array(), "must not be an array");
93 // notify jvmti and dtrace
94 post_allocation_notify(klass, (oop)obj);
95 }
96
97 void CollectedHeap::post_allocation_setup_array(KlassHandle klass,
98 HeapWord* obj,
99 int length) {
100 // Set array length before setting the _klass field
101 // in post_allocation_setup_common() because the klass field
102 // indicates that the object is parsable by concurrent GC.
103 assert(length >= 0, "length should be non-negative");
104 ((arrayOop)obj)->set_length(length);
105 post_allocation_setup_common(klass, obj);
106 assert(((oop)obj)->is_array(), "must be an array");
107 // notify jvmti and dtrace (must be after length is set for dtrace)
108 post_allocation_notify(klass, (oop)obj);
109 }
110
111 HeapWord* CollectedHeap::common_mem_allocate_noinit(KlassHandle klass, size_t size, TRAPS) {
112
113 // Clear unhandled oops for memory allocation. Memory allocation might
114 // not take out a lock if from tlab, so clear here.
115 CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();)
116
117 if (HAS_PENDING_EXCEPTION) {
118 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));
119 return NULL; // caller does a CHECK_0 too
120 }
121
122 HeapWord* result = NULL;
123 if (UseTLAB) {
124 result = allocate_from_tlab(klass, THREAD, size);
125 if (result != NULL) {
126 assert(!HAS_PENDING_EXCEPTION,
127 "Unexpected exception, will result in uninitialized storage");
128 return result;
129 }
130 }
131 bool gc_overhead_limit_was_exceeded = false;
132 result = Universe::heap()->mem_allocate(size,
133 &gc_overhead_limit_was_exceeded);
134 if (result != NULL) {
135 NOT_PRODUCT(Universe::heap()->
136 check_for_non_bad_heap_word_value(result, size));
137 assert(!HAS_PENDING_EXCEPTION,
138 "Unexpected exception, will result in uninitialized storage");
139 THREAD->incr_allocated_bytes(size * HeapWordSize);
140
141 AllocTracer::send_allocation_outside_tlab_event(klass, size * HeapWordSize);
142
143 return result;
144 }
145
146
147 if (!gc_overhead_limit_was_exceeded) {
148 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
149 report_java_out_of_memory("Java heap space");
150
151 if (JvmtiExport::should_post_resource_exhausted()) {
152 JvmtiExport::post_resource_exhausted(
153 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_JAVA_HEAP,
154 "Java heap space");
155 }
156
157 THROW_OOP_0(Universe::out_of_memory_error_java_heap());
158 } else {
159 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
160 report_java_out_of_memory("GC overhead limit exceeded");
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 "GC overhead limit exceeded");
166 }
167
168 THROW_OOP_0(Universe::out_of_memory_error_gc_overhead_limit());
169 }
170 }
171
172 HeapWord* CollectedHeap::common_mem_allocate_init(KlassHandle klass, size_t size, TRAPS) {
173 HeapWord* obj = common_mem_allocate_noinit(klass, size, CHECK_NULL);
174 init_obj(obj, size);
175 return obj;
176 }
177
178 HeapWord* CollectedHeap::allocate_from_tlab(KlassHandle klass, Thread* thread, size_t size) {
179 assert(UseTLAB, "should use UseTLAB");
180
181 HeapWord* obj = thread->tlab().allocate(size);
182 if (obj != NULL) {
183 return obj;
184 }
185 // Otherwise...
186 return allocate_from_tlab_slow(klass, thread, size);
187 }
188
189 void CollectedHeap::init_obj(HeapWord* obj, size_t size) {
190 assert(obj != NULL, "cannot initialize NULL object");
191 const size_t hs = oopDesc::header_size();
192 assert(size >= hs, "unexpected object size");
193 ((oop)obj)->set_klass_gap(0);
194 Copy::fill_to_aligned_words(obj + hs, size - hs);
195 }
196
197 oop CollectedHeap::obj_allocate(KlassHandle klass, int size, TRAPS) {
198 debug_only(check_for_valid_allocation_state());
199 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
200 assert(size >= 0, "int won't convert to size_t");
201 HeapWord* obj = common_mem_allocate_init(klass, size, CHECK_NULL);
202 post_allocation_setup_obj(klass, obj);
203 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
204 return (oop)obj;
205 }
206
207 oop CollectedHeap::array_allocate(KlassHandle klass,
208 int size,
209 int length,
210 TRAPS) {
211 debug_only(check_for_valid_allocation_state());
212 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
213 assert(size >= 0, "int won't convert to size_t");
214 HeapWord* obj = common_mem_allocate_init(klass, size, CHECK_NULL);
215 post_allocation_setup_array(klass, obj, length);
216 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
217 return (oop)obj;
218 }
219
220 oop CollectedHeap::array_allocate_nozero(KlassHandle klass,
221 int size,
222 int length,
223 TRAPS) {
224 debug_only(check_for_valid_allocation_state());
225 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
226 assert(size >= 0, "int won't convert to size_t");
227 HeapWord* obj = common_mem_allocate_noinit(klass, size, CHECK_NULL);
228 ((oop)obj)->set_klass_gap(0);
229 post_allocation_setup_array(klass, obj, length);
230 #ifndef PRODUCT
231 const size_t hs = oopDesc::header_size()+1;
232 Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs);
233 #endif
234 return (oop)obj;
235 }
236
237 inline void CollectedHeap::oop_iterate_no_header(OopClosure* cl) {
238 NoHeaderExtendedOopClosure no_header_cl(cl);
239 oop_iterate(&no_header_cl);
240 }
241
242 #ifndef PRODUCT
243
244 inline bool
245 CollectedHeap::promotion_should_fail(volatile size_t* count) {
246 // Access to count is not atomic; the value does not have to be exact.
247 if (PromotionFailureALot) {
248 const size_t gc_num = total_collections();
249 const size_t elapsed_gcs = gc_num - _promotion_failure_alot_gc_number;
250 if (elapsed_gcs >= PromotionFailureALotInterval) {
251 // Test for unsigned arithmetic wrap-around.
252 if (++*count >= PromotionFailureALotCount) {
253 *count = 0;
254 return true;
255 }
256 }
257 }
258 return false;
259 }
260
261 inline bool CollectedHeap::promotion_should_fail() {
262 return promotion_should_fail(&_promotion_failure_alot_count);
263 }
264
265 inline void CollectedHeap::reset_promotion_should_fail(volatile size_t* count) {
266 if (PromotionFailureALot) {
267 _promotion_failure_alot_gc_number = total_collections();
268 *count = 0;
269 }
270 }
271
272 inline void CollectedHeap::reset_promotion_should_fail() {
273 reset_promotion_should_fail(&_promotion_failure_alot_count);
274 }
275 #endif // #ifndef PRODUCT
276
277 #endif // SHARE_VM_GC_INTERFACE_COLLECTEDHEAP_INLINE_HPP