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