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comparison src/share/vm/gc_interface/collectedHeap.inline.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 9a9bb0010c91
children 59c790074993 f34d701e952e
comparison
equal deleted inserted replaced
6724:36d1d483d5d6 6725:da91efe96a93
72 oop obj) { 72 oop obj) {
73 // These asserts are kind of complicated because of klassKlass 73 // These asserts are kind of complicated because of klassKlass
74 // and the beginning of the world. 74 // and the beginning of the world.
75 assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass"); 75 assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass");
76 assert(klass() == NULL || klass()->is_klass(), "not a 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"); 77 assert(obj != NULL, "NULL object pointer");
79 obj->set_klass(klass()); 78 obj->set_klass(klass());
80 assert(!Universe::is_fully_initialized() || obj->blueprint() != NULL, 79 assert(!Universe::is_fully_initialized() || obj->klass() != NULL,
81 "missing blueprint"); 80 "missing klass");
82 } 81 }
83 82
84 // Support for jvmti and dtrace 83 // Support for jvmti and dtrace
85 inline void post_allocation_notify(KlassHandle klass, oop obj) { 84 inline void post_allocation_notify(KlassHandle klass, oop obj) {
86 // support low memory notifications (no-op if not enabled) 85 // support low memory notifications (no-op if not enabled)
89 // support for JVMTI VMObjectAlloc event (no-op if not enabled) 88 // support for JVMTI VMObjectAlloc event (no-op if not enabled)
90 JvmtiExport::vm_object_alloc_event_collector(obj); 89 JvmtiExport::vm_object_alloc_event_collector(obj);
91 90
92 if (DTraceAllocProbes) { 91 if (DTraceAllocProbes) {
93 // support for Dtrace object alloc event (no-op most of the time) 92 // support for Dtrace object alloc event (no-op most of the time)
94 if (klass() != NULL && klass()->klass_part()->name() != NULL) { 93 if (klass() != NULL && klass()->name() != NULL) {
95 SharedRuntime::dtrace_object_alloc(obj); 94 SharedRuntime::dtrace_object_alloc(obj);
96 } 95 }
97 } 96 }
98 } 97 }
99 98
100 void CollectedHeap::post_allocation_setup_obj(KlassHandle klass, 99 void CollectedHeap::post_allocation_setup_obj(KlassHandle klass,
101 HeapWord* obj) { 100 HeapWord* obj) {
102 post_allocation_setup_common(klass, obj); 101 post_allocation_setup_common(klass, obj);
103 assert(Universe::is_bootstrapping() || 102 assert(Universe::is_bootstrapping() ||
104 !((oop)obj)->blueprint()->oop_is_array(), "must not be an array"); 103 !((oop)obj)->is_array(), "must not be an array");
105 // notify jvmti and dtrace 104 // notify jvmti and dtrace
106 post_allocation_notify(klass, (oop)obj); 105 post_allocation_notify(klass, (oop)obj);
107 } 106 }
108 107
109 void CollectedHeap::post_allocation_setup_array(KlassHandle klass, 108 void CollectedHeap::post_allocation_setup_array(KlassHandle klass,
113 // in post_allocation_setup_common() because the klass field 112 // in post_allocation_setup_common() because the klass field
114 // indicates that the object is parsable by concurrent GC. 113 // indicates that the object is parsable by concurrent GC.
115 assert(length >= 0, "length should be non-negative"); 114 assert(length >= 0, "length should be non-negative");
116 ((arrayOop)obj)->set_length(length); 115 ((arrayOop)obj)->set_length(length);
117 post_allocation_setup_common(klass, obj); 116 post_allocation_setup_common(klass, obj);
118 assert(((oop)obj)->blueprint()->oop_is_array(), "must be an array"); 117 assert(((oop)obj)->is_array(), "must be an array");
119 // notify jvmti and dtrace (must be after length is set for dtrace) 118 // notify jvmti and dtrace (must be after length is set for dtrace)
120 post_allocation_notify(klass, (oop)obj); 119 post_allocation_notify(klass, (oop)obj);
121 } 120 }
122 121
123 HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, TRAPS) { 122 HeapWord* CollectedHeap::common_mem_allocate_noinit(size_t size, TRAPS) {
178 } 177 }
179 } 178 }
180 179
181 HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, TRAPS) { 180 HeapWord* CollectedHeap::common_mem_allocate_init(size_t size, TRAPS) {
182 HeapWord* obj = common_mem_allocate_noinit(size, CHECK_NULL); 181 HeapWord* obj = common_mem_allocate_noinit(size, CHECK_NULL);
183 init_obj(obj, size);
184 return obj;
185 }
186
187 // Need to investigate, do we really want to throw OOM exception here?
188 HeapWord* CollectedHeap::common_permanent_mem_allocate_noinit(size_t size, TRAPS) {
189 if (HAS_PENDING_EXCEPTION) {
190 NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));
191 return NULL; // caller does a CHECK_NULL too
192 }
193
194 #ifdef ASSERT
195 if (CIFireOOMAt > 0 && THREAD->is_Compiler_thread() &&
196 ++_fire_out_of_memory_count >= CIFireOOMAt) {
197 // For testing of OOM handling in the CI throw an OOM and see how
198 // it does. Historically improper handling of these has resulted
199 // in crashes which we really don't want to have in the CI.
200 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
201 }
202 #endif
203
204 HeapWord* result = Universe::heap()->permanent_mem_allocate(size);
205 if (result != NULL) {
206 NOT_PRODUCT(Universe::heap()->
207 check_for_non_bad_heap_word_value(result, size));
208 assert(!HAS_PENDING_EXCEPTION,
209 "Unexpected exception, will result in uninitialized storage");
210 return result;
211 }
212 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
213 report_java_out_of_memory("PermGen space");
214
215 if (JvmtiExport::should_post_resource_exhausted()) {
216 JvmtiExport::post_resource_exhausted(
217 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
218 "PermGen space");
219 }
220
221 THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
222 }
223
224 HeapWord* CollectedHeap::common_permanent_mem_allocate_init(size_t size, TRAPS) {
225 HeapWord* obj = common_permanent_mem_allocate_noinit(size, CHECK_NULL);
226 init_obj(obj, size); 182 init_obj(obj, size);
227 return obj; 183 return obj;
228 } 184 }
229 185
230 HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) { 186 HeapWord* CollectedHeap::allocate_from_tlab(Thread* thread, size_t size) {
284 Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs); 240 Universe::heap()->check_for_non_bad_heap_word_value(obj+hs, size-hs);
285 #endif 241 #endif
286 return (oop)obj; 242 return (oop)obj;
287 } 243 }
288 244
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);
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);
305 #ifndef PRODUCT
306 const size_t hs = oopDesc::header_size();
307 Universe::heap()->check_for_bad_heap_word_value(obj+hs, size-hs);
308 #endif
309 return (oop)obj;
310 }
311
312 oop CollectedHeap::permanent_array_allocate(KlassHandle klass,
313 int size,
314 int length,
315 TRAPS) {
316 debug_only(check_for_valid_allocation_state());
317 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
318 assert(size >= 0, "int won't convert to size_t");
319 HeapWord* obj = common_permanent_mem_allocate_init(size, CHECK_NULL);
320 post_allocation_setup_array(klass, obj, length);
321 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
322 return (oop)obj;
323 }
324
325 // Returns "TRUE" if "p" is a method oop in the 245 // Returns "TRUE" if "p" is a method oop in the
326 // current heap with high probability. NOTE: The main 246 // current heap with high probability. NOTE: The main
327 // current consumers of this interface are Forte:: 247 // current consumers of this interface are Forte::
328 // and ThreadProfiler::. In these cases, the 248 // and ThreadProfiler::. In these cases, the
329 // interpreter frame from which "p" came, may be 249 // interpreter frame from which "p" came, may be
332 // valid method before using it. Nonetheless since 252 // valid method before using it. Nonetheless since
333 // the clients do not typically lock out GC, the 253 // the clients do not typically lock out GC, the
334 // predicate is_valid_method() is not stable, so 254 // predicate is_valid_method() is not stable, so
335 // it is possible that by the time "p" is used, it 255 // it is possible that by the time "p" is used, it
336 // is no longer valid. 256 // is no longer valid.
337 inline bool CollectedHeap::is_valid_method(oop p) const { 257 inline bool CollectedHeap::is_valid_method(Method* p) const {
338 return 258 return
339 p != NULL && 259 p != NULL &&
340 260
341 // Check whether it is aligned at a HeapWord boundary. 261 // Check whether "method" is metadata
342 Space::is_aligned(p) && 262 p->is_metadata() &&
343
344 // Check whether "method" is in the allocated part of the
345 // permanent generation -- this needs to be checked before
346 // p->klass() below to avoid a SEGV (but see below
347 // for a potential window of vulnerability).
348 is_permanent((void*)p) &&
349 263
350 // See if GC is active; however, there is still an 264 // See if GC is active; however, there is still an
351 // apparently unavoidable window after this call 265 // apparently unavoidable window after this call
352 // and before the client of this interface uses "p". 266 // and before the client of this interface uses "p".
353 // If the client chooses not to lock out GC, then 267 // If the client chooses not to lock out GC, then
354 // it's a risk the client must accept. 268 // it's a risk the client must accept.
355 !is_gc_active() && 269 !is_gc_active() &&
356 270
357 // Check that p is a methodOop. 271 // Check that p is a Method*.
358 p->klass() == Universe::methodKlassObj(); 272 p->is_method();
359 } 273 }
360 274
275 inline void CollectedHeap::oop_iterate_no_header(OopClosure* cl) {
276 NoHeaderExtendedOopClosure no_header_cl(cl);
277 oop_iterate(&no_header_cl);
278 }
361 279
362 #ifndef PRODUCT 280 #ifndef PRODUCT
363 281
364 inline bool 282 inline bool
365 CollectedHeap::promotion_should_fail(volatile size_t* count) { 283 CollectedHeap::promotion_should_fail(volatile size_t* count) {