Thu, 07 Aug 2014 22:28:53 +0200
8054341: Remove some obsolete code in G1CollectedHeap class
Summary: Remove dead code.
Reviewed-by: stefank, brutisso
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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13 * accompanied this code).
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP
28 #include "gc_implementation/g1/concurrentMark.hpp"
29 #include "gc_implementation/g1/g1CollectedHeap.hpp"
30 #include "gc_implementation/g1/g1AllocRegion.inline.hpp"
31 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
32 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
33 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
34 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
35 #include "runtime/orderAccess.inline.hpp"
36 #include "utilities/taskqueue.hpp"
38 // Inline functions for G1CollectedHeap
40 // Return the region with the given index. It assumes the index is valid.
41 inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrs.at(index); }
43 inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const {
44 assert(is_in_reserved(addr),
45 err_msg("Cannot calculate region index for address "PTR_FORMAT" that is outside of the heap ["PTR_FORMAT", "PTR_FORMAT")",
46 p2i(addr), p2i(_reserved.start()), p2i(_reserved.end())));
47 return (uint)(pointer_delta(addr, _reserved.start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes);
48 }
50 template <class T>
51 inline HeapRegion*
52 G1CollectedHeap::heap_region_containing(const T addr) const {
53 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) addr);
54 // hr can be null if addr in perm_gen
55 if (hr != NULL && hr->continuesHumongous()) {
56 hr = hr->humongous_start_region();
57 }
58 return hr;
59 }
61 template <class T>
62 inline HeapRegion*
63 G1CollectedHeap::heap_region_containing_raw(const T addr) const {
64 assert(_g1_reserved.contains((const void*) addr), "invariant");
65 HeapRegion* res = _hrs.addr_to_region_unsafe((HeapWord*) addr);
66 return res;
67 }
69 inline void G1CollectedHeap::reset_gc_time_stamp() {
70 _gc_time_stamp = 0;
71 OrderAccess::fence();
72 // Clear the cached CSet starting regions and time stamps.
73 // Their validity is dependent on the GC timestamp.
74 clear_cset_start_regions();
75 }
77 inline void G1CollectedHeap::increment_gc_time_stamp() {
78 ++_gc_time_stamp;
79 OrderAccess::fence();
80 }
82 inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {
83 _old_set.remove(hr);
84 }
86 inline bool G1CollectedHeap::obj_in_cs(oop obj) {
87 HeapRegion* r = _hrs.addr_to_region((HeapWord*) obj);
88 return r != NULL && r->in_collection_set();
89 }
91 inline HeapWord*
92 G1CollectedHeap::attempt_allocation(size_t word_size,
93 unsigned int* gc_count_before_ret,
94 int* gclocker_retry_count_ret) {
95 assert_heap_not_locked_and_not_at_safepoint();
96 assert(!isHumongous(word_size), "attempt_allocation() should not "
97 "be called for humongous allocation requests");
99 HeapWord* result = _mutator_alloc_region.attempt_allocation(word_size,
100 false /* bot_updates */);
101 if (result == NULL) {
102 result = attempt_allocation_slow(word_size,
103 gc_count_before_ret,
104 gclocker_retry_count_ret);
105 }
106 assert_heap_not_locked();
107 if (result != NULL) {
108 dirty_young_block(result, word_size);
109 }
110 return result;
111 }
113 inline HeapWord* G1CollectedHeap::survivor_attempt_allocation(size_t
114 word_size) {
115 assert(!isHumongous(word_size),
116 "we should not be seeing humongous-size allocations in this path");
118 HeapWord* result = _survivor_gc_alloc_region.attempt_allocation(word_size,
119 false /* bot_updates */);
120 if (result == NULL) {
121 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
122 result = _survivor_gc_alloc_region.attempt_allocation_locked(word_size,
123 false /* bot_updates */);
124 }
125 if (result != NULL) {
126 dirty_young_block(result, word_size);
127 }
128 return result;
129 }
131 inline HeapWord* G1CollectedHeap::old_attempt_allocation(size_t word_size) {
132 assert(!isHumongous(word_size),
133 "we should not be seeing humongous-size allocations in this path");
135 HeapWord* result = _old_gc_alloc_region.attempt_allocation(word_size,
136 true /* bot_updates */);
137 if (result == NULL) {
138 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
139 result = _old_gc_alloc_region.attempt_allocation_locked(word_size,
140 true /* bot_updates */);
141 }
142 return result;
143 }
145 // It dirties the cards that cover the block so that so that the post
146 // write barrier never queues anything when updating objects on this
147 // block. It is assumed (and in fact we assert) that the block
148 // belongs to a young region.
149 inline void
150 G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {
151 assert_heap_not_locked();
153 // Assign the containing region to containing_hr so that we don't
154 // have to keep calling heap_region_containing_raw() in the
155 // asserts below.
156 DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing_raw(start);)
157 assert(containing_hr != NULL && start != NULL && word_size > 0,
158 "pre-condition");
159 assert(containing_hr->is_in(start), "it should contain start");
160 assert(containing_hr->is_young(), "it should be young");
161 assert(!containing_hr->isHumongous(), "it should not be humongous");
163 HeapWord* end = start + word_size;
164 assert(containing_hr->is_in(end - 1), "it should also contain end - 1");
166 MemRegion mr(start, end);
167 g1_barrier_set()->g1_mark_as_young(mr);
168 }
170 inline RefToScanQueue* G1CollectedHeap::task_queue(int i) const {
171 return _task_queues->queue(i);
172 }
174 inline bool G1CollectedHeap::isMarkedPrev(oop obj) const {
175 return _cm->prevMarkBitMap()->isMarked((HeapWord *)obj);
176 }
178 inline bool G1CollectedHeap::isMarkedNext(oop obj) const {
179 return _cm->nextMarkBitMap()->isMarked((HeapWord *)obj);
180 }
182 // This is a fast test on whether a reference points into the
183 // collection set or not. Assume that the reference
184 // points into the heap.
185 inline bool G1CollectedHeap::is_in_cset(oop obj) {
186 bool ret = _in_cset_fast_test.is_in_cset((HeapWord*)obj);
187 // let's make sure the result is consistent with what the slower
188 // test returns
189 assert( ret || !obj_in_cs(obj), "sanity");
190 assert(!ret || obj_in_cs(obj), "sanity");
191 return ret;
192 }
194 bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) {
195 return _in_cset_fast_test.is_in_cset_or_humongous((HeapWord*)obj);
196 }
198 G1CollectedHeap::in_cset_state_t G1CollectedHeap::in_cset_state(const oop obj) {
199 return _in_cset_fast_test.at((HeapWord*)obj);
200 }
202 void G1CollectedHeap::register_humongous_region_with_in_cset_fast_test(uint index) {
203 _in_cset_fast_test.set_humongous(index);
204 }
206 #ifndef PRODUCT
207 // Support for G1EvacuationFailureALot
209 inline bool
210 G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool gcs_are_young,
211 bool during_initial_mark,
212 bool during_marking) {
213 bool res = false;
214 if (during_marking) {
215 res |= G1EvacuationFailureALotDuringConcMark;
216 }
217 if (during_initial_mark) {
218 res |= G1EvacuationFailureALotDuringInitialMark;
219 }
220 if (gcs_are_young) {
221 res |= G1EvacuationFailureALotDuringYoungGC;
222 } else {
223 // GCs are mixed
224 res |= G1EvacuationFailureALotDuringMixedGC;
225 }
226 return res;
227 }
229 inline void
230 G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {
231 if (G1EvacuationFailureALot) {
232 // Note we can't assert that _evacuation_failure_alot_for_current_gc
233 // is clear here. It may have been set during a previous GC but that GC
234 // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to
235 // trigger an evacuation failure and clear the flags and and counts.
237 // Check if we have gone over the interval.
238 const size_t gc_num = total_collections();
239 const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;
241 _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);
243 // Now check if G1EvacuationFailureALot is enabled for the current GC type.
244 const bool gcs_are_young = g1_policy()->gcs_are_young();
245 const bool during_im = g1_policy()->during_initial_mark_pause();
246 const bool during_marking = mark_in_progress();
248 _evacuation_failure_alot_for_current_gc &=
249 evacuation_failure_alot_for_gc_type(gcs_are_young,
250 during_im,
251 during_marking);
252 }
253 }
255 inline bool
256 G1CollectedHeap::evacuation_should_fail() {
257 if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {
258 return false;
259 }
260 // G1EvacuationFailureALot is in effect for current GC
261 // Access to _evacuation_failure_alot_count is not atomic;
262 // the value does not have to be exact.
263 if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {
264 return false;
265 }
266 _evacuation_failure_alot_count = 0;
267 return true;
268 }
270 inline void G1CollectedHeap::reset_evacuation_should_fail() {
271 if (G1EvacuationFailureALot) {
272 _evacuation_failure_alot_gc_number = total_collections();
273 _evacuation_failure_alot_count = 0;
274 _evacuation_failure_alot_for_current_gc = false;
275 }
276 }
277 #endif // #ifndef PRODUCT
279 inline bool G1CollectedHeap::is_in_young(const oop obj) {
280 HeapRegion* hr = heap_region_containing(obj);
281 return hr != NULL && hr->is_young();
282 }
284 // We don't need barriers for initializing stores to objects
285 // in the young gen: for the SATB pre-barrier, there is no
286 // pre-value that needs to be remembered; for the remembered-set
287 // update logging post-barrier, we don't maintain remembered set
288 // information for young gen objects.
289 inline bool G1CollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
290 return is_in_young(new_obj);
291 }
293 inline bool G1CollectedHeap::is_obj_dead(const oop obj) const {
294 const HeapRegion* hr = heap_region_containing(obj);
295 if (hr == NULL) {
296 if (obj == NULL) return false;
297 else return true;
298 }
299 else return is_obj_dead(obj, hr);
300 }
302 inline bool G1CollectedHeap::is_obj_ill(const oop obj) const {
303 const HeapRegion* hr = heap_region_containing(obj);
304 if (hr == NULL) {
305 if (obj == NULL) return false;
306 else return true;
307 }
308 else return is_obj_ill(obj, hr);
309 }
311 inline void G1CollectedHeap::set_humongous_is_live(oop obj) {
312 uint region = addr_to_region((HeapWord*)obj);
313 // We not only set the "live" flag in the humongous_is_live table, but also
314 // reset the entry in the _in_cset_fast_test table so that subsequent references
315 // to the same humongous object do not go into the slow path again.
316 // This is racy, as multiple threads may at the same time enter here, but this
317 // is benign.
318 // During collection we only ever set the "live" flag, and only ever clear the
319 // entry in the in_cset_fast_table.
320 // We only ever evaluate the contents of these tables (in the VM thread) after
321 // having synchronized the worker threads with the VM thread, or in the same
322 // thread (i.e. within the VM thread).
323 if (!_humongous_is_live.is_live(region)) {
324 _humongous_is_live.set_live(region);
325 _in_cset_fast_test.clear_humongous(region);
326 }
327 }
329 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_INLINE_HPP