ysr@777: /*
tschatzl@5701:  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
stefank@2314: #include "precompiled.hpp"
johnc@5548: #include "code/nmethod.hpp"
stefank@2314: #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp"
stefank@2314: #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
stefank@2314: #include "gc_implementation/g1/g1OopClosures.inline.hpp"
stefank@2314: #include "gc_implementation/g1/heapRegion.inline.hpp"
stefank@2314: #include "gc_implementation/g1/heapRegionRemSet.hpp"
stefank@2314: #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
stefank@2314: #include "memory/genOopClosures.inline.hpp"
stefank@2314: #include "memory/iterator.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
ysr@777: 
johnc@3182: int    HeapRegion::LogOfHRGrainBytes = 0;
johnc@3182: int    HeapRegion::LogOfHRGrainWords = 0;
johnc@3182: size_t HeapRegion::GrainBytes        = 0;
johnc@3182: size_t HeapRegion::GrainWords        = 0;
johnc@3182: size_t HeapRegion::CardsPerRegion    = 0;
tonyp@1377: 
ysr@777: HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1,
coleenp@4037:                                  HeapRegion* hr, ExtendedOopClosure* cl,
ysr@777:                                  CardTableModRefBS::PrecisionStyle precision,
ysr@777:                                  FilterKind fk) :
ysr@777:   ContiguousSpaceDCTOC(hr, cl, precision, NULL),
tonyp@3957:   _hr(hr), _fk(fk), _g1(g1) { }
ysr@777: 
ysr@777: FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r,
ysr@777:                                                    OopClosure* oc) :
tonyp@3957:   _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { }
ysr@777: 
ysr@777: template<class ClosureType>
ysr@777: HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h,
ysr@777:                                HeapRegion* hr,
ysr@777:                                HeapWord* cur, HeapWord* top) {
ysr@777:   oop cur_oop = oop(cur);
ysr@777:   int oop_size = cur_oop->size();
ysr@777:   HeapWord* next_obj = cur + oop_size;
ysr@777:   while (next_obj < top) {
ysr@777:     // Keep filtering the remembered set.
ysr@777:     if (!g1h->is_obj_dead(cur_oop, hr)) {
ysr@777:       // Bottom lies entirely below top, so we can call the
ysr@777:       // non-memRegion version of oop_iterate below.
ysr@777:       cur_oop->oop_iterate(cl);
ysr@777:     }
ysr@777:     cur = next_obj;
ysr@777:     cur_oop = oop(cur);
ysr@777:     oop_size = cur_oop->size();
ysr@777:     next_obj = cur + oop_size;
ysr@777:   }
ysr@777:   return cur;
ysr@777: }
ysr@777: 
ysr@777: void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr,
ysr@777:                                               HeapWord* bottom,
ysr@777:                                               HeapWord* top,
coleenp@4037:                                               ExtendedOopClosure* cl) {
ysr@777:   G1CollectedHeap* g1h = _g1;
johnc@3179:   int oop_size;
coleenp@4037:   ExtendedOopClosure* cl2 = NULL;
ysr@777: 
johnc@3179:   FilterIntoCSClosure intoCSFilt(this, g1h, cl);
ysr@777:   FilterOutOfRegionClosure outOfRegionFilt(_hr, cl);
johnc@3175: 
ysr@777:   switch (_fk) {
johnc@3179:   case NoFilterKind:          cl2 = cl; break;
ysr@777:   case IntoCSFilterKind:      cl2 = &intoCSFilt; break;
ysr@777:   case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break;
johnc@3179:   default:                    ShouldNotReachHere();
ysr@777:   }
ysr@777: 
ysr@777:   // Start filtering what we add to the remembered set. If the object is
ysr@777:   // not considered dead, either because it is marked (in the mark bitmap)
ysr@777:   // or it was allocated after marking finished, then we add it. Otherwise
ysr@777:   // we can safely ignore the object.
ysr@777:   if (!g1h->is_obj_dead(oop(bottom), _hr)) {
ysr@777:     oop_size = oop(bottom)->oop_iterate(cl2, mr);
ysr@777:   } else {
ysr@777:     oop_size = oop(bottom)->size();
ysr@777:   }
ysr@777: 
ysr@777:   bottom += oop_size;
ysr@777: 
ysr@777:   if (bottom < top) {
ysr@777:     // We replicate the loop below for several kinds of possible filters.
ysr@777:     switch (_fk) {
ysr@777:     case NoFilterKind:
ysr@777:       bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top);
ysr@777:       break;
johnc@3175: 
ysr@777:     case IntoCSFilterKind: {
johnc@3179:       FilterIntoCSClosure filt(this, g1h, cl);
ysr@777:       bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top);
ysr@777:       break;
ysr@777:     }
johnc@3175: 
ysr@777:     case OutOfRegionFilterKind: {
ysr@777:       FilterOutOfRegionClosure filt(_hr, cl);
ysr@777:       bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top);
ysr@777:       break;
ysr@777:     }
johnc@3175: 
ysr@777:     default:
ysr@777:       ShouldNotReachHere();
ysr@777:     }
ysr@777: 
ysr@777:     // Last object. Need to do dead-obj filtering here too.
ysr@777:     if (!g1h->is_obj_dead(oop(bottom), _hr)) {
ysr@777:       oop(bottom)->oop_iterate(cl2, mr);
ysr@777:     }
ysr@777:   }
ysr@777: }
ysr@777: 
tonyp@1377: // Minimum region size; we won't go lower than that.
tonyp@1377: // We might want to decrease this in the future, to deal with small
tonyp@1377: // heaps a bit more efficiently.
tonyp@1377: #define MIN_REGION_SIZE  (      1024 * 1024 )
tonyp@1377: 
tonyp@1377: // Maximum region size; we don't go higher than that. There's a good
tonyp@1377: // reason for having an upper bound. We don't want regions to get too
tonyp@1377: // large, otherwise cleanup's effectiveness would decrease as there
tonyp@1377: // will be fewer opportunities to find totally empty regions after
tonyp@1377: // marking.
tonyp@1377: #define MAX_REGION_SIZE  ( 32 * 1024 * 1024 )
tonyp@1377: 
tonyp@1377: // The automatic region size calculation will try to have around this
tonyp@1377: // many regions in the heap (based on the min heap size).
tonyp@1377: #define TARGET_REGION_NUMBER          2048
tonyp@1377: 
tschatzl@5701: size_t HeapRegion::max_region_size() {
tschatzl@5701:   return (size_t)MAX_REGION_SIZE;
tschatzl@5701: }
tschatzl@5701: 
brutisso@5646: void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) {
tonyp@1377:   uintx region_size = G1HeapRegionSize;
tonyp@1377:   if (FLAG_IS_DEFAULT(G1HeapRegionSize)) {
brutisso@5646:     size_t average_heap_size = (initial_heap_size + max_heap_size) / 2;
brutisso@5646:     region_size = MAX2(average_heap_size / TARGET_REGION_NUMBER,
tonyp@1377:                        (uintx) MIN_REGION_SIZE);
tonyp@1377:   }
tonyp@1377: 
tonyp@1377:   int region_size_log = log2_long((jlong) region_size);
tonyp@1377:   // Recalculate the region size to make sure it's a power of
tonyp@1377:   // 2. This means that region_size is the largest power of 2 that's
tonyp@1377:   // <= what we've calculated so far.
prr@1840:   region_size = ((uintx)1 << region_size_log);
tonyp@1377: 
tonyp@1377:   // Now make sure that we don't go over or under our limits.
tonyp@1377:   if (region_size < MIN_REGION_SIZE) {
tonyp@1377:     region_size = MIN_REGION_SIZE;
tonyp@1377:   } else if (region_size > MAX_REGION_SIZE) {
tonyp@1377:     region_size = MAX_REGION_SIZE;
tonyp@1377:   }
tonyp@1377: 
brutisso@5464:   if (region_size != G1HeapRegionSize) {
brutisso@5464:     // Update the flag to make sure that PrintFlagsFinal logs the correct value
brutisso@5464:     FLAG_SET_ERGO(uintx, G1HeapRegionSize, region_size);
brutisso@5464:   }
brutisso@5464: 
tonyp@1377:   // And recalculate the log.
tonyp@1377:   region_size_log = log2_long((jlong) region_size);
tonyp@1377: 
tonyp@1377:   // Now, set up the globals.
tonyp@1377:   guarantee(LogOfHRGrainBytes == 0, "we should only set it once");
tonyp@1377:   LogOfHRGrainBytes = region_size_log;
tonyp@1377: 
tonyp@1377:   guarantee(LogOfHRGrainWords == 0, "we should only set it once");
tonyp@1377:   LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize;
tonyp@1377: 
tonyp@1377:   guarantee(GrainBytes == 0, "we should only set it once");
tonyp@1377:   // The cast to int is safe, given that we've bounded region_size by
tonyp@1377:   // MIN_REGION_SIZE and MAX_REGION_SIZE.
johnc@3182:   GrainBytes = (size_t)region_size;
tonyp@1377: 
tonyp@1377:   guarantee(GrainWords == 0, "we should only set it once");
tonyp@1377:   GrainWords = GrainBytes >> LogHeapWordSize;
tonyp@3713:   guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity");
tonyp@1377: 
tonyp@1377:   guarantee(CardsPerRegion == 0, "we should only set it once");
tonyp@1377:   CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift;
tonyp@1377: }
tonyp@1377: 
ysr@777: void HeapRegion::reset_after_compaction() {
ysr@777:   G1OffsetTableContigSpace::reset_after_compaction();
ysr@777:   // After a compaction the mark bitmap is invalid, so we must
ysr@777:   // treat all objects as being inside the unmarked area.
ysr@777:   zero_marked_bytes();
ysr@777:   init_top_at_mark_start();
ysr@777: }
ysr@777: 
ysr@777: void HeapRegion::hr_clear(bool par, bool clear_space) {
tonyp@2472:   assert(_humongous_type == NotHumongous,
tonyp@2472:          "we should have already filtered out humongous regions");
tonyp@2472:   assert(_humongous_start_region == NULL,
tonyp@2472:          "we should have already filtered out humongous regions");
tonyp@2472:   assert(_end == _orig_end,
tonyp@2472:          "we should have already filtered out humongous regions");
tonyp@2472: 
ysr@777:   _in_collection_set = false;
ysr@777: 
ysr@777:   set_young_index_in_cset(-1);
ysr@777:   uninstall_surv_rate_group();
ysr@777:   set_young_type(NotYoung);
tonyp@2715:   reset_pre_dummy_top();
ysr@777: 
ysr@777:   if (!par) {
ysr@777:     // If this is parallel, this will be done later.
ysr@777:     HeapRegionRemSet* hrrs = rem_set();
johnc@5548:     hrrs->clear();
tonyp@790:     _claimed = InitialClaimValue;
ysr@777:   }
ysr@777:   zero_marked_bytes();
ysr@777: 
ysr@777:   _offsets.resize(HeapRegion::GrainWords);
ysr@777:   init_top_at_mark_start();
tonyp@791:   if (clear_space) clear(SpaceDecorator::Mangle);
ysr@777: }
ysr@777: 
tonyp@2849: void HeapRegion::par_clear() {
tonyp@2849:   assert(used() == 0, "the region should have been already cleared");
johnc@3182:   assert(capacity() == HeapRegion::GrainBytes, "should be back to normal");
tonyp@2849:   HeapRegionRemSet* hrrs = rem_set();
tonyp@2849:   hrrs->clear();
tonyp@2849:   CardTableModRefBS* ct_bs =
tonyp@2849:                    (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set();
tonyp@2849:   ct_bs->clear(MemRegion(bottom(), end()));
tonyp@2849: }
tonyp@2849: 
ysr@777: void HeapRegion::calc_gc_efficiency() {
johnc@3998:   // GC efficiency is the ratio of how much space would be
johnc@3998:   // reclaimed over how long we predict it would take to reclaim it.
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
tonyp@3539:   G1CollectorPolicy* g1p = g1h->g1_policy();
johnc@3998: 
johnc@3998:   // Retrieve a prediction of the elapsed time for this region for
johnc@3998:   // a mixed gc because the region will only be evacuated during a
johnc@3998:   // mixed gc.
johnc@3998:   double region_elapsed_time_ms =
johnc@3998:     g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */);
johnc@3998:   _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms;
ysr@777: }
ysr@777: 
tonyp@2453: void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) {
tonyp@2472:   assert(!isHumongous(), "sanity / pre-condition");
tonyp@2241:   assert(end() == _orig_end,
tonyp@2241:          "Should be normal before the humongous object allocation");
tonyp@2241:   assert(top() == bottom(), "should be empty");
tonyp@2453:   assert(bottom() <= new_top && new_top <= new_end, "pre-condition");
tonyp@2241: 
tonyp@790:   _humongous_type = StartsHumongous;
ysr@777:   _humongous_start_region = this;
tonyp@2241: 
tonyp@2241:   set_end(new_end);
tonyp@2453:   _offsets.set_for_starts_humongous(new_top);
tonyp@2241: }
tonyp@2241: 
tonyp@2453: void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) {
tonyp@2472:   assert(!isHumongous(), "sanity / pre-condition");
tonyp@2241:   assert(end() == _orig_end,
tonyp@2241:          "Should be normal before the humongous object allocation");
tonyp@2241:   assert(top() == bottom(), "should be empty");
tonyp@2453:   assert(first_hr->startsHumongous(), "pre-condition");
tonyp@2241: 
tonyp@2241:   _humongous_type = ContinuesHumongous;
tonyp@2453:   _humongous_start_region = first_hr;
ysr@777: }
ysr@777: 
tonyp@2472: void HeapRegion::set_notHumongous() {
tonyp@2472:   assert(isHumongous(), "pre-condition");
tonyp@2472: 
tonyp@2472:   if (startsHumongous()) {
tonyp@2472:     assert(top() <= end(), "pre-condition");
tonyp@2472:     set_end(_orig_end);
tonyp@2472:     if (top() > end()) {
tonyp@2472:       // at least one "continues humongous" region after it
tonyp@2472:       set_top(end());
tonyp@2472:     }
tonyp@2472:   } else {
tonyp@2472:     // continues humongous
tonyp@2472:     assert(end() == _orig_end, "sanity");
tonyp@2472:   }
tonyp@2472: 
johnc@3182:   assert(capacity() == HeapRegion::GrainBytes, "pre-condition");
tonyp@2472:   _humongous_type = NotHumongous;
tonyp@2472:   _humongous_start_region = NULL;
tonyp@2472: }
tonyp@2472: 
ysr@777: bool HeapRegion::claimHeapRegion(jint claimValue) {
ysr@777:   jint current = _claimed;
ysr@777:   if (current != claimValue) {
ysr@777:     jint res = Atomic::cmpxchg(claimValue, &_claimed, current);
ysr@777:     if (res == current) {
ysr@777:       return true;
ysr@777:     }
ysr@777:   }
ysr@777:   return false;
ysr@777: }
ysr@777: 
ysr@777: HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) {
ysr@777:   HeapWord* low = addr;
ysr@777:   HeapWord* high = end();
ysr@777:   while (low < high) {
ysr@777:     size_t diff = pointer_delta(high, low);
ysr@777:     // Must add one below to bias toward the high amount.  Otherwise, if
ysr@777:   // "high" were at the desired value, and "low" were one less, we
ysr@777:     // would not converge on "high".  This is not symmetric, because
ysr@777:     // we set "high" to a block start, which might be the right one,
ysr@777:     // which we don't do for "low".
ysr@777:     HeapWord* middle = low + (diff+1)/2;
ysr@777:     if (middle == high) return high;
ysr@777:     HeapWord* mid_bs = block_start_careful(middle);
ysr@777:     if (mid_bs < addr) {
ysr@777:       low = middle;
ysr@777:     } else {
ysr@777:       high = mid_bs;
ysr@777:     }
ysr@777:   }
ysr@777:   assert(low == high && low >= addr, "Didn't work.");
ysr@777:   return low;
ysr@777: }
ysr@777: 
ysr@777: #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
ysr@777: #pragma warning( disable:4355 ) // 'this' : used in base member initializer list
ysr@777: #endif // _MSC_VER
ysr@777: 
ysr@777: 
tonyp@3713: HeapRegion::HeapRegion(uint hrs_index,
tonyp@3713:                        G1BlockOffsetSharedArray* sharedOffsetArray,
johnc@4065:                        MemRegion mr) :
johnc@4065:     G1OffsetTableContigSpace(sharedOffsetArray, mr),
johnc@3175:     _hrs_index(hrs_index),
tonyp@790:     _humongous_type(NotHumongous), _humongous_start_region(NULL),
tonyp@3028:     _in_collection_set(false),
ysr@777:     _next_in_special_set(NULL), _orig_end(NULL),
tonyp@790:     _claimed(InitialClaimValue), _evacuation_failed(false),
tonyp@3714:     _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0),
ysr@777:     _young_type(NotYoung), _next_young_region(NULL),
tonyp@2472:     _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false),
tonyp@2472: #ifdef ASSERT
tonyp@2472:     _containing_set(NULL),
tonyp@2472: #endif // ASSERT
tonyp@2472:      _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1),
tonyp@2472:     _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0),
johnc@1829:     _predicted_bytes_to_copy(0)
ysr@777: {
johnc@5548:   _rem_set = new HeapRegionRemSet(sharedOffsetArray, this);
ysr@777:   _orig_end = mr.end();
ysr@777:   // Note that initialize() will set the start of the unmarked area of the
ysr@777:   // region.
johnc@4065:   hr_clear(false /*par*/, false /*clear_space*/);
tonyp@791:   set_top(bottom());
tonyp@791:   set_saved_mark();
ysr@777: 
ysr@777:   assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant.");
ysr@777: }
ysr@777: 
tonyp@3957: CompactibleSpace* HeapRegion::next_compaction_space() const {
tonyp@3957:   // We're not using an iterator given that it will wrap around when
tonyp@3957:   // it reaches the last region and this is not what we want here.
tonyp@3957:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
tonyp@3957:   uint index = hrs_index() + 1;
tonyp@3957:   while (index < g1h->n_regions()) {
tonyp@3957:     HeapRegion* hr = g1h->region_at(index);
tonyp@3957:     if (!hr->isHumongous()) {
tonyp@3957:       return hr;
ysr@777:     }
tonyp@3957:     index += 1;
ysr@777:   }
tonyp@3957:   return NULL;
ysr@777: }
ysr@777: 
ysr@777: void HeapRegion::save_marks() {
ysr@777:   set_saved_mark();
ysr@777: }
ysr@777: 
coleenp@4037: void HeapRegion::oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl) {
ysr@777:   HeapWord* p = mr.start();
ysr@777:   HeapWord* e = mr.end();
ysr@777:   oop obj;
ysr@777:   while (p < e) {
ysr@777:     obj = oop(p);
ysr@777:     p += obj->oop_iterate(cl);
ysr@777:   }
ysr@777:   assert(p == e, "bad memregion: doesn't end on obj boundary");
ysr@777: }
ysr@777: 
ysr@777: #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \
ysr@777: void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \
ysr@777:   ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl);              \
ysr@777: }
ysr@777: SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN)
ysr@777: 
ysr@777: 
coleenp@4037: void HeapRegion::oop_before_save_marks_iterate(ExtendedOopClosure* cl) {
ysr@777:   oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl);
ysr@777: }
ysr@777: 
tonyp@3416: void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark,
tonyp@3416:                                                     bool during_conc_mark) {
tonyp@3416:   // We always recreate the prev marking info and we'll explicitly
tonyp@3416:   // mark all objects we find to be self-forwarded on the prev
tonyp@3416:   // bitmap. So all objects need to be below PTAMS.
tonyp@3416:   _prev_top_at_mark_start = top();
tonyp@3416:   _prev_marked_bytes = 0;
tonyp@3416: 
tonyp@3416:   if (during_initial_mark) {
tonyp@3416:     // During initial-mark, we'll also explicitly mark all objects
tonyp@3416:     // we find to be self-forwarded on the next bitmap. So all
tonyp@3416:     // objects need to be below NTAMS.
tonyp@3416:     _next_top_at_mark_start = top();
tonyp@3416:     _next_marked_bytes = 0;
tonyp@3416:   } else if (during_conc_mark) {
tonyp@3416:     // During concurrent mark, all objects in the CSet (including
tonyp@3416:     // the ones we find to be self-forwarded) are implicitly live.
tonyp@3416:     // So all objects need to be above NTAMS.
tonyp@3416:     _next_top_at_mark_start = bottom();
tonyp@3416:     _next_marked_bytes = 0;
tonyp@3416:   }
tonyp@3416: }
tonyp@3416: 
tonyp@3416: void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark,
tonyp@3416:                                                   bool during_conc_mark,
tonyp@3416:                                                   size_t marked_bytes) {
tonyp@3416:   assert(0 <= marked_bytes && marked_bytes <= used(),
tonyp@3416:          err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT,
tonyp@3416:                  marked_bytes, used()));
tonyp@3416:   _prev_marked_bytes = marked_bytes;
tonyp@3416: }
tonyp@3416: 
ysr@777: HeapWord*
ysr@777: HeapRegion::object_iterate_mem_careful(MemRegion mr,
ysr@777:                                                  ObjectClosure* cl) {
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
ysr@777:   // We used to use "block_start_careful" here.  But we're actually happy
ysr@777:   // to update the BOT while we do this...
ysr@777:   HeapWord* cur = block_start(mr.start());
ysr@777:   mr = mr.intersection(used_region());
ysr@777:   if (mr.is_empty()) return NULL;
ysr@777:   // Otherwise, find the obj that extends onto mr.start().
ysr@777: 
ysr@777:   assert(cur <= mr.start()
ysr@1280:          && (oop(cur)->klass_or_null() == NULL ||
ysr@777:              cur + oop(cur)->size() > mr.start()),
ysr@777:          "postcondition of block_start");
ysr@777:   oop obj;
ysr@777:   while (cur < mr.end()) {
ysr@777:     obj = oop(cur);
ysr@1280:     if (obj->klass_or_null() == NULL) {
ysr@777:       // Ran into an unparseable point.
ysr@777:       return cur;
ysr@777:     } else if (!g1h->is_obj_dead(obj)) {
ysr@777:       cl->do_object(obj);
ysr@777:     }
ysr@777:     if (cl->abort()) return cur;
ysr@777:     // The check above must occur before the operation below, since an
ysr@777:     // abort might invalidate the "size" operation.
ysr@777:     cur += obj->size();
ysr@777:   }
ysr@777:   return NULL;
ysr@777: }
ysr@777: 
ysr@777: HeapWord*
ysr@777: HeapRegion::
ysr@777: oops_on_card_seq_iterate_careful(MemRegion mr,
johnc@2021:                                  FilterOutOfRegionClosure* cl,
tonyp@2849:                                  bool filter_young,
tonyp@2849:                                  jbyte* card_ptr) {
tonyp@2849:   // Currently, we should only have to clean the card if filter_young
tonyp@2849:   // is true and vice versa.
tonyp@2849:   if (filter_young) {
tonyp@2849:     assert(card_ptr != NULL, "pre-condition");
tonyp@2849:   } else {
tonyp@2849:     assert(card_ptr == NULL, "pre-condition");
tonyp@2849:   }
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
ysr@777: 
ysr@777:   // If we're within a stop-world GC, then we might look at a card in a
ysr@777:   // GC alloc region that extends onto a GC LAB, which may not be
ysr@777:   // parseable.  Stop such at the "saved_mark" of the region.
johnc@3466:   if (g1h->is_gc_active()) {
ysr@777:     mr = mr.intersection(used_region_at_save_marks());
ysr@777:   } else {
ysr@777:     mr = mr.intersection(used_region());
ysr@777:   }
ysr@777:   if (mr.is_empty()) return NULL;
ysr@777:   // Otherwise, find the obj that extends onto mr.start().
ysr@777: 
johnc@2021:   // The intersection of the incoming mr (for the card) and the
johnc@2021:   // allocated part of the region is non-empty. This implies that
johnc@2021:   // we have actually allocated into this region. The code in
johnc@2021:   // G1CollectedHeap.cpp that allocates a new region sets the
johnc@2021:   // is_young tag on the region before allocating. Thus we
johnc@2021:   // safely know if this region is young.
johnc@2021:   if (is_young() && filter_young) {
johnc@2021:     return NULL;
johnc@2021:   }
johnc@2021: 
johnc@2060:   assert(!is_young(), "check value of filter_young");
johnc@2060: 
tonyp@2849:   // We can only clean the card here, after we make the decision that
tonyp@2849:   // the card is not young. And we only clean the card if we have been
tonyp@2849:   // asked to (i.e., card_ptr != NULL).
tonyp@2849:   if (card_ptr != NULL) {
tonyp@2849:     *card_ptr = CardTableModRefBS::clean_card_val();
tonyp@2849:     // We must complete this write before we do any of the reads below.
tonyp@2849:     OrderAccess::storeload();
tonyp@2849:   }
tonyp@2849: 
johnc@3466:   // Cache the boundaries of the memory region in some const locals
johnc@3466:   HeapWord* const start = mr.start();
johnc@3466:   HeapWord* const end = mr.end();
johnc@3466: 
ysr@777:   // We used to use "block_start_careful" here.  But we're actually happy
ysr@777:   // to update the BOT while we do this...
johnc@3466:   HeapWord* cur = block_start(start);
johnc@3466:   assert(cur <= start, "Postcondition");
ysr@777: 
johnc@3466:   oop obj;
johnc@3466: 
johnc@3466:   HeapWord* next = cur;
johnc@3466:   while (next <= start) {
johnc@3466:     cur = next;
johnc@3466:     obj = oop(cur);
johnc@3466:     if (obj->klass_or_null() == NULL) {
ysr@777:       // Ran into an unparseable point.
ysr@777:       return cur;
ysr@777:     }
ysr@777:     // Otherwise...
johnc@3466:     next = (cur + obj->size());
ysr@777:   }
johnc@3466: 
johnc@3466:   // If we finish the above loop...We have a parseable object that
johnc@3466:   // begins on or before the start of the memory region, and ends
johnc@3466:   // inside or spans the entire region.
johnc@3466: 
johnc@3466:   assert(obj == oop(cur), "sanity");
johnc@3466:   assert(cur <= start &&
johnc@3466:          obj->klass_or_null() != NULL &&
johnc@3466:          (cur + obj->size()) > start,
ysr@777:          "Loop postcondition");
johnc@3466: 
ysr@777:   if (!g1h->is_obj_dead(obj)) {
ysr@777:     obj->oop_iterate(cl, mr);
ysr@777:   }
ysr@777: 
johnc@3466:   while (cur < end) {
ysr@777:     obj = oop(cur);
ysr@1280:     if (obj->klass_or_null() == NULL) {
ysr@777:       // Ran into an unparseable point.
ysr@777:       return cur;
ysr@777:     };
johnc@3466: 
ysr@777:     // Otherwise:
ysr@777:     next = (cur + obj->size());
johnc@3466: 
ysr@777:     if (!g1h->is_obj_dead(obj)) {
johnc@3466:       if (next < end || !obj->is_objArray()) {
johnc@3466:         // This object either does not span the MemRegion
johnc@3466:         // boundary, or if it does it's not an array.
johnc@3466:         // Apply closure to whole object.
ysr@777:         obj->oop_iterate(cl);
ysr@777:       } else {
johnc@3466:         // This obj is an array that spans the boundary.
johnc@3466:         // Stop at the boundary.
johnc@3466:         obj->oop_iterate(cl, mr);
ysr@777:       }
ysr@777:     }
ysr@777:     cur = next;
ysr@777:   }
ysr@777:   return NULL;
ysr@777: }
ysr@777: 
johnc@5548: // Code roots support
johnc@5548: 
johnc@5548: void HeapRegion::add_strong_code_root(nmethod* nm) {
johnc@5548:   HeapRegionRemSet* hrrs = rem_set();
johnc@5548:   hrrs->add_strong_code_root(nm);
johnc@5548: }
johnc@5548: 
johnc@5548: void HeapRegion::remove_strong_code_root(nmethod* nm) {
johnc@5548:   HeapRegionRemSet* hrrs = rem_set();
johnc@5548:   hrrs->remove_strong_code_root(nm);
johnc@5548: }
johnc@5548: 
johnc@5548: void HeapRegion::migrate_strong_code_roots() {
johnc@5548:   assert(in_collection_set(), "only collection set regions");
johnc@5548:   assert(!isHumongous(), "not humongous regions");
johnc@5548: 
johnc@5548:   HeapRegionRemSet* hrrs = rem_set();
johnc@5548:   hrrs->migrate_strong_code_roots();
johnc@5548: }
johnc@5548: 
johnc@5548: void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const {
johnc@5548:   HeapRegionRemSet* hrrs = rem_set();
johnc@5548:   hrrs->strong_code_roots_do(blk);
johnc@5548: }
johnc@5548: 
johnc@5548: class VerifyStrongCodeRootOopClosure: public OopClosure {
johnc@5548:   const HeapRegion* _hr;
johnc@5548:   nmethod* _nm;
johnc@5548:   bool _failures;
johnc@5548:   bool _has_oops_in_region;
johnc@5548: 
johnc@5548:   template <class T> void do_oop_work(T* p) {
johnc@5548:     T heap_oop = oopDesc::load_heap_oop(p);
johnc@5548:     if (!oopDesc::is_null(heap_oop)) {
johnc@5548:       oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
johnc@5548: 
johnc@5548:       // Note: not all the oops embedded in the nmethod are in the
johnc@5548:       // current region. We only look at those which are.
johnc@5548:       if (_hr->is_in(obj)) {
johnc@5548:         // Object is in the region. Check that its less than top
johnc@5548:         if (_hr->top() <= (HeapWord*)obj) {
johnc@5548:           // Object is above top
johnc@5548:           gclog_or_tty->print_cr("Object "PTR_FORMAT" in region "
johnc@5548:                                  "["PTR_FORMAT", "PTR_FORMAT") is above "
johnc@5548:                                  "top "PTR_FORMAT,
hseigel@5784:                                  (void *)obj, _hr->bottom(), _hr->end(), _hr->top());
johnc@5548:           _failures = true;
johnc@5548:           return;
johnc@5548:         }
johnc@5548:         // Nmethod has at least one oop in the current region
johnc@5548:         _has_oops_in_region = true;
johnc@5548:       }
johnc@5548:     }
johnc@5548:   }
johnc@5548: 
johnc@5548: public:
johnc@5548:   VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm):
johnc@5548:     _hr(hr), _failures(false), _has_oops_in_region(false) {}
johnc@5548: 
johnc@5548:   void do_oop(narrowOop* p) { do_oop_work(p); }
johnc@5548:   void do_oop(oop* p)       { do_oop_work(p); }
johnc@5548: 
johnc@5548:   bool failures()           { return _failures; }
johnc@5548:   bool has_oops_in_region() { return _has_oops_in_region; }
johnc@5548: };
johnc@5548: 
johnc@5548: class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure {
johnc@5548:   const HeapRegion* _hr;
johnc@5548:   bool _failures;
johnc@5548: public:
johnc@5548:   VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) :
johnc@5548:     _hr(hr), _failures(false) {}
johnc@5548: 
johnc@5548:   void do_code_blob(CodeBlob* cb) {
johnc@5548:     nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null();
johnc@5548:     if (nm != NULL) {
johnc@5548:       // Verify that the nemthod is live
johnc@5548:       if (!nm->is_alive()) {
johnc@5548:         gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod "
johnc@5548:                                PTR_FORMAT" in its strong code roots",
johnc@5548:                                _hr->bottom(), _hr->end(), nm);
johnc@5548:         _failures = true;
johnc@5548:       } else {
johnc@5548:         VerifyStrongCodeRootOopClosure oop_cl(_hr, nm);
johnc@5548:         nm->oops_do(&oop_cl);
johnc@5548:         if (!oop_cl.has_oops_in_region()) {
johnc@5548:           gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod "
johnc@5548:                                  PTR_FORMAT" in its strong code roots "
johnc@5548:                                  "with no pointers into region",
johnc@5548:                                  _hr->bottom(), _hr->end(), nm);
johnc@5548:           _failures = true;
johnc@5548:         } else if (oop_cl.failures()) {
johnc@5548:           gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other "
johnc@5548:                                  "failures for nmethod "PTR_FORMAT,
johnc@5548:                                  _hr->bottom(), _hr->end(), nm);
johnc@5548:           _failures = true;
johnc@5548:         }
johnc@5548:       }
johnc@5548:     }
johnc@5548:   }
johnc@5548: 
johnc@5548:   bool failures()       { return _failures; }
johnc@5548: };
johnc@5548: 
johnc@5548: void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const {
johnc@5548:   if (!G1VerifyHeapRegionCodeRoots) {
johnc@5548:     // We're not verifying code roots.
johnc@5548:     return;
johnc@5548:   }
johnc@5548:   if (vo == VerifyOption_G1UseMarkWord) {
johnc@5548:     // Marking verification during a full GC is performed after class
johnc@5548:     // unloading, code cache unloading, etc so the strong code roots
johnc@5548:     // attached to each heap region are in an inconsistent state. They won't
johnc@5548:     // be consistent until the strong code roots are rebuilt after the
johnc@5548:     // actual GC. Skip verifying the strong code roots in this particular
johnc@5548:     // time.
johnc@5548:     assert(VerifyDuringGC, "only way to get here");
johnc@5548:     return;
johnc@5548:   }
johnc@5548: 
johnc@5548:   HeapRegionRemSet* hrrs = rem_set();
johnc@5548:   int strong_code_roots_length = hrrs->strong_code_roots_list_length();
johnc@5548: 
johnc@5548:   // if this region is empty then there should be no entries
johnc@5548:   // on its strong code root list
johnc@5548:   if (is_empty()) {
johnc@5548:     if (strong_code_roots_length > 0) {
johnc@5548:       gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty "
johnc@5548:                              "but has "INT32_FORMAT" code root entries",
johnc@5548:                              bottom(), end(), strong_code_roots_length);
johnc@5548:       *failures = true;
johnc@5548:     }
johnc@5548:     return;
johnc@5548:   }
johnc@5548: 
johnc@5548:   // An H-region should have an empty strong code root list
johnc@5548:   if (isHumongous()) {
johnc@5548:     if (strong_code_roots_length > 0) {
johnc@5548:       gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous "
johnc@5548:                              "but has "INT32_FORMAT" code root entries",
johnc@5548:                              bottom(), end(), strong_code_roots_length);
johnc@5548:       *failures = true;
johnc@5548:     }
johnc@5548:     return;
johnc@5548:   }
johnc@5548: 
johnc@5548:   VerifyStrongCodeRootCodeBlobClosure cb_cl(this);
johnc@5548:   strong_code_roots_do(&cb_cl);
johnc@5548: 
johnc@5548:   if (cb_cl.failures()) {
johnc@5548:     *failures = true;
johnc@5548:   }
johnc@5548: }
johnc@5548: 
ysr@777: void HeapRegion::print() const { print_on(gclog_or_tty); }
ysr@777: void HeapRegion::print_on(outputStream* st) const {
ysr@777:   if (isHumongous()) {
ysr@777:     if (startsHumongous())
ysr@777:       st->print(" HS");
ysr@777:     else
ysr@777:       st->print(" HC");
ysr@777:   } else {
ysr@777:     st->print("   ");
ysr@777:   }
ysr@777:   if (in_collection_set())
ysr@777:     st->print(" CS");
ysr@777:   else
ysr@777:     st->print("   ");
ysr@777:   if (is_young())
johnc@1829:     st->print(is_survivor() ? " SU" : " Y ");
ysr@777:   else
ysr@777:     st->print("   ");
ysr@777:   if (is_empty())
ysr@777:     st->print(" F");
ysr@777:   else
ysr@777:     st->print("  ");
tonyp@3269:   st->print(" TS %5d", _gc_time_stamp);
tonyp@1823:   st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT,
tonyp@1823:             prev_top_at_mark_start(), next_top_at_mark_start());
ysr@777:   G1OffsetTableContigSpace::print_on(st);
ysr@777: }
ysr@777: 
johnc@5548: class VerifyLiveClosure: public OopClosure {
johnc@5548: private:
johnc@5548:   G1CollectedHeap* _g1h;
johnc@5548:   CardTableModRefBS* _bs;
johnc@5548:   oop _containing_obj;
johnc@5548:   bool _failures;
johnc@5548:   int _n_failures;
johnc@5548:   VerifyOption _vo;
johnc@5548: public:
johnc@5548:   // _vo == UsePrevMarking -> use "prev" marking information,
johnc@5548:   // _vo == UseNextMarking -> use "next" marking information,
johnc@5548:   // _vo == UseMarkWord    -> use mark word from object header.
johnc@5548:   VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) :
johnc@5548:     _g1h(g1h), _bs(NULL), _containing_obj(NULL),
johnc@5548:     _failures(false), _n_failures(0), _vo(vo)
johnc@5548:   {
johnc@5548:     BarrierSet* bs = _g1h->barrier_set();
johnc@5548:     if (bs->is_a(BarrierSet::CardTableModRef))
johnc@5548:       _bs = (CardTableModRefBS*)bs;
johnc@5548:   }
johnc@5548: 
johnc@5548:   void set_containing_obj(oop obj) {
johnc@5548:     _containing_obj = obj;
johnc@5548:   }
johnc@5548: 
johnc@5548:   bool failures() { return _failures; }
johnc@5548:   int n_failures() { return _n_failures; }
johnc@5548: 
johnc@5548:   virtual void do_oop(narrowOop* p) { do_oop_work(p); }
johnc@5548:   virtual void do_oop(      oop* p) { do_oop_work(p); }
johnc@5548: 
johnc@5548:   void print_object(outputStream* out, oop obj) {
johnc@5548: #ifdef PRODUCT
johnc@5548:     Klass* k = obj->klass();
johnc@5548:     const char* class_name = InstanceKlass::cast(k)->external_name();
johnc@5548:     out->print_cr("class name %s", class_name);
johnc@5548: #else // PRODUCT
johnc@5548:     obj->print_on(out);
johnc@5548: #endif // PRODUCT
johnc@5548:   }
johnc@5548: 
johnc@5548:   template <class T>
johnc@5548:   void do_oop_work(T* p) {
johnc@5548:     assert(_containing_obj != NULL, "Precondition");
johnc@5548:     assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo),
johnc@5548:            "Precondition");
johnc@5548:     T heap_oop = oopDesc::load_heap_oop(p);
johnc@5548:     if (!oopDesc::is_null(heap_oop)) {
johnc@5548:       oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
johnc@5548:       bool failed = false;
johnc@5548:       if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) {
johnc@5548:         MutexLockerEx x(ParGCRareEvent_lock,
johnc@5548:                         Mutex::_no_safepoint_check_flag);
johnc@5548: 
johnc@5548:         if (!_failures) {
johnc@5548:           gclog_or_tty->print_cr("");
johnc@5548:           gclog_or_tty->print_cr("----------");
johnc@5548:         }
johnc@5548:         if (!_g1h->is_in_closed_subset(obj)) {
johnc@5548:           HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
johnc@5548:           gclog_or_tty->print_cr("Field "PTR_FORMAT
johnc@5548:                                  " of live obj "PTR_FORMAT" in region "
johnc@5548:                                  "["PTR_FORMAT", "PTR_FORMAT")",
johnc@5548:                                  p, (void*) _containing_obj,
johnc@5548:                                  from->bottom(), from->end());
johnc@5548:           print_object(gclog_or_tty, _containing_obj);
johnc@5548:           gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap",
johnc@5548:                                  (void*) obj);
johnc@5548:         } else {
johnc@5548:           HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
johnc@5548:           HeapRegion* to   = _g1h->heap_region_containing((HeapWord*)obj);
johnc@5548:           gclog_or_tty->print_cr("Field "PTR_FORMAT
johnc@5548:                                  " of live obj "PTR_FORMAT" in region "
johnc@5548:                                  "["PTR_FORMAT", "PTR_FORMAT")",
johnc@5548:                                  p, (void*) _containing_obj,
johnc@5548:                                  from->bottom(), from->end());
johnc@5548:           print_object(gclog_or_tty, _containing_obj);
johnc@5548:           gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region "
johnc@5548:                                  "["PTR_FORMAT", "PTR_FORMAT")",
johnc@5548:                                  (void*) obj, to->bottom(), to->end());
johnc@5548:           print_object(gclog_or_tty, obj);
johnc@5548:         }
johnc@5548:         gclog_or_tty->print_cr("----------");
johnc@5548:         gclog_or_tty->flush();
johnc@5548:         _failures = true;
johnc@5548:         failed = true;
johnc@5548:         _n_failures++;
johnc@5548:       }
johnc@5548: 
johnc@5548:       if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) {
johnc@5548:         HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
johnc@5548:         HeapRegion* to   = _g1h->heap_region_containing(obj);
johnc@5548:         if (from != NULL && to != NULL &&
johnc@5548:             from != to &&
johnc@5548:             !to->isHumongous()) {
johnc@5548:           jbyte cv_obj = *_bs->byte_for_const(_containing_obj);
johnc@5548:           jbyte cv_field = *_bs->byte_for_const(p);
johnc@5548:           const jbyte dirty = CardTableModRefBS::dirty_card_val();
johnc@5548: 
johnc@5548:           bool is_bad = !(from->is_young()
johnc@5548:                           || to->rem_set()->contains_reference(p)
johnc@5548:                           || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed
johnc@5548:                               (_containing_obj->is_objArray() ?
johnc@5548:                                   cv_field == dirty
johnc@5548:                                : cv_obj == dirty || cv_field == dirty));
johnc@5548:           if (is_bad) {
johnc@5548:             MutexLockerEx x(ParGCRareEvent_lock,
johnc@5548:                             Mutex::_no_safepoint_check_flag);
johnc@5548: 
johnc@5548:             if (!_failures) {
johnc@5548:               gclog_or_tty->print_cr("");
johnc@5548:               gclog_or_tty->print_cr("----------");
johnc@5548:             }
johnc@5548:             gclog_or_tty->print_cr("Missing rem set entry:");
johnc@5548:             gclog_or_tty->print_cr("Field "PTR_FORMAT" "
johnc@5548:                                    "of obj "PTR_FORMAT", "
johnc@5548:                                    "in region "HR_FORMAT,
johnc@5548:                                    p, (void*) _containing_obj,
johnc@5548:                                    HR_FORMAT_PARAMS(from));
johnc@5548:             _containing_obj->print_on(gclog_or_tty);
johnc@5548:             gclog_or_tty->print_cr("points to obj "PTR_FORMAT" "
johnc@5548:                                    "in region "HR_FORMAT,
johnc@5548:                                    (void*) obj,
johnc@5548:                                    HR_FORMAT_PARAMS(to));
johnc@5548:             obj->print_on(gclog_or_tty);
johnc@5548:             gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.",
johnc@5548:                           cv_obj, cv_field);
johnc@5548:             gclog_or_tty->print_cr("----------");
johnc@5548:             gclog_or_tty->flush();
johnc@5548:             _failures = true;
johnc@5548:             if (!failed) _n_failures++;
johnc@5548:           }
johnc@5548:         }
johnc@5548:       }
johnc@5548:     }
johnc@5548:   }
johnc@5548: };
tonyp@1246: 
ysr@777: // This really ought to be commoned up into OffsetTableContigSpace somehow.
ysr@777: // We would need a mechanism to make that code skip dead objects.
ysr@777: 
brutisso@3711: void HeapRegion::verify(VerifyOption vo,
tonyp@1455:                         bool* failures) const {
ysr@777:   G1CollectedHeap* g1 = G1CollectedHeap::heap();
tonyp@1455:   *failures = false;
ysr@777:   HeapWord* p = bottom();
ysr@777:   HeapWord* prev_p = NULL;
johnc@2969:   VerifyLiveClosure vl_cl(g1, vo);
tonyp@2073:   bool is_humongous = isHumongous();
tonyp@2453:   bool do_bot_verify = !is_young();
tonyp@2073:   size_t object_num = 0;
ysr@777:   while (p < top()) {
tonyp@2453:     oop obj = oop(p);
tonyp@2453:     size_t obj_size = obj->size();
tonyp@2453:     object_num += 1;
tonyp@2453: 
tonyp@2453:     if (is_humongous != g1->isHumongous(obj_size)) {
tonyp@2073:       gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size ("
tonyp@2073:                              SIZE_FORMAT" words) in a %shumongous region",
tonyp@2453:                              p, g1->isHumongous(obj_size) ? "" : "non-",
tonyp@2453:                              obj_size, is_humongous ? "" : "non-");
tonyp@2073:        *failures = true;
tonyp@2453:        return;
tonyp@2073:     }
tonyp@2453: 
tonyp@2453:     // If it returns false, verify_for_object() will output the
tonyp@2453:     // appropriate messasge.
tonyp@2453:     if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) {
tonyp@2453:       *failures = true;
tonyp@2453:       return;
tonyp@2453:     }
tonyp@2453: 
johnc@2969:     if (!g1->is_obj_dead_cond(obj, this, vo)) {
tonyp@2453:       if (obj->is_oop()) {
coleenp@4037:         Klass* klass = obj->klass();
coleenp@5307:         if (!klass->is_metaspace_object()) {
tonyp@2453:           gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" "
hseigel@5784:                                  "not metadata", klass, (void *)obj);
tonyp@2453:           *failures = true;
tonyp@2453:           return;
tonyp@2453:         } else if (!klass->is_klass()) {
tonyp@2453:           gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" "
hseigel@5784:                                  "not a klass", klass, (void *)obj);
tonyp@2453:           *failures = true;
tonyp@2453:           return;
tonyp@2453:         } else {
tonyp@2453:           vl_cl.set_containing_obj(obj);
coleenp@4037:           obj->oop_iterate_no_header(&vl_cl);
tonyp@2453:           if (vl_cl.failures()) {
tonyp@2453:             *failures = true;
tonyp@2453:           }
tonyp@2453:           if (G1MaxVerifyFailures >= 0 &&
tonyp@2453:               vl_cl.n_failures() >= G1MaxVerifyFailures) {
tonyp@2453:             return;
tonyp@2453:           }
tonyp@2453:         }
tonyp@2453:       } else {
hseigel@5784:         gclog_or_tty->print_cr(PTR_FORMAT" no an oop", (void *)obj);
tonyp@1455:         *failures = true;
tonyp@1455:         return;
tonyp@1455:       }
ysr@777:     }
ysr@777:     prev_p = p;
tonyp@2453:     p += obj_size;
ysr@777:   }
tonyp@2453: 
tonyp@2453:   if (p != top()) {
tonyp@2453:     gclog_or_tty->print_cr("end of last object "PTR_FORMAT" "
tonyp@2453:                            "does not match top "PTR_FORMAT, p, top());
tonyp@2453:     *failures = true;
tonyp@2453:     return;
tonyp@2453:   }
tonyp@2453: 
tonyp@2453:   HeapWord* the_end = end();
tonyp@2453:   assert(p == top(), "it should still hold");
tonyp@2453:   // Do some extra BOT consistency checking for addresses in the
tonyp@2453:   // range [top, end). BOT look-ups in this range should yield
tonyp@2453:   // top. No point in doing that if top == end (there's nothing there).
tonyp@2453:   if (p < the_end) {
tonyp@2453:     // Look up top
tonyp@2453:     HeapWord* addr_1 = p;
tonyp@2453:     HeapWord* b_start_1 = _offsets.block_start_const(addr_1);
tonyp@2453:     if (b_start_1 != p) {
tonyp@2453:       gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" "
tonyp@2453:                              " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
tonyp@2453:                              addr_1, b_start_1, p);
tonyp@2453:       *failures = true;
tonyp@2453:       return;
tonyp@2453:     }
tonyp@2453: 
tonyp@2453:     // Look up top + 1
tonyp@2453:     HeapWord* addr_2 = p + 1;
tonyp@2453:     if (addr_2 < the_end) {
tonyp@2453:       HeapWord* b_start_2 = _offsets.block_start_const(addr_2);
tonyp@2453:       if (b_start_2 != p) {
tonyp@2453:         gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" "
tonyp@2453:                                " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
tonyp@2453:                                addr_2, b_start_2, p);
tonyp@1455:         *failures = true;
tonyp@1455:         return;
tonyp@2453:       }
tonyp@2453:     }
tonyp@2453: 
tonyp@2453:     // Look up an address between top and end
tonyp@2453:     size_t diff = pointer_delta(the_end, p) / 2;
tonyp@2453:     HeapWord* addr_3 = p + diff;
tonyp@2453:     if (addr_3 < the_end) {
tonyp@2453:       HeapWord* b_start_3 = _offsets.block_start_const(addr_3);
tonyp@2453:       if (b_start_3 != p) {
tonyp@2453:         gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" "
tonyp@2453:                                " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
tonyp@2453:                                addr_3, b_start_3, p);
tonyp@2453:         *failures = true;
tonyp@2453:         return;
tonyp@2453:       }
tonyp@2453:     }
tonyp@2453: 
tonyp@2453:     // Loook up end - 1
tonyp@2453:     HeapWord* addr_4 = the_end - 1;
tonyp@2453:     HeapWord* b_start_4 = _offsets.block_start_const(addr_4);
tonyp@2453:     if (b_start_4 != p) {
tonyp@2453:       gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" "
tonyp@2453:                              " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
tonyp@2453:                              addr_4, b_start_4, p);
tonyp@2453:       *failures = true;
tonyp@2453:       return;
tonyp@1455:     }
ysr@777:   }
tonyp@1455: 
tonyp@2073:   if (is_humongous && object_num > 1) {
tonyp@2073:     gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous "
tonyp@2073:                            "but has "SIZE_FORMAT", objects",
tonyp@2073:                            bottom(), end(), object_num);
tonyp@2073:     *failures = true;
tonyp@1455:     return;
ysr@777:   }
johnc@5548: 
johnc@5548:   verify_strong_code_roots(vo, failures);
johnc@5548: }
johnc@5548: 
johnc@5548: void HeapRegion::verify() const {
johnc@5548:   bool dummy = false;
johnc@5548:   verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy);
ysr@777: }
ysr@777: 
ysr@777: // G1OffsetTableContigSpace code; copied from space.cpp.  Hope this can go
ysr@777: // away eventually.
ysr@777: 
tonyp@791: void G1OffsetTableContigSpace::clear(bool mangle_space) {
tonyp@791:   ContiguousSpace::clear(mangle_space);
ysr@777:   _offsets.zero_bottom_entry();
ysr@777:   _offsets.initialize_threshold();
ysr@777: }
ysr@777: 
ysr@777: void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) {
ysr@777:   Space::set_bottom(new_bottom);
ysr@777:   _offsets.set_bottom(new_bottom);
ysr@777: }
ysr@777: 
ysr@777: void G1OffsetTableContigSpace::set_end(HeapWord* new_end) {
ysr@777:   Space::set_end(new_end);
ysr@777:   _offsets.resize(new_end - bottom());
ysr@777: }
ysr@777: 
ysr@777: void G1OffsetTableContigSpace::print() const {
ysr@777:   print_short();
ysr@777:   gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", "
ysr@777:                 INTPTR_FORMAT ", " INTPTR_FORMAT ")",
ysr@777:                 bottom(), top(), _offsets.threshold(), end());
ysr@777: }
ysr@777: 
ysr@777: HeapWord* G1OffsetTableContigSpace::initialize_threshold() {
ysr@777:   return _offsets.initialize_threshold();
ysr@777: }
ysr@777: 
ysr@777: HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start,
ysr@777:                                                     HeapWord* end) {
ysr@777:   _offsets.alloc_block(start, end);
ysr@777:   return _offsets.threshold();
ysr@777: }
ysr@777: 
ysr@777: HeapWord* G1OffsetTableContigSpace::saved_mark_word() const {
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
ysr@777:   assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" );
ysr@777:   if (_gc_time_stamp < g1h->get_gc_time_stamp())
ysr@777:     return top();
ysr@777:   else
ysr@777:     return ContiguousSpace::saved_mark_word();
ysr@777: }
ysr@777: 
ysr@777: void G1OffsetTableContigSpace::set_saved_mark() {
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
ysr@777:   unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp();
ysr@777: 
ysr@777:   if (_gc_time_stamp < curr_gc_time_stamp) {
ysr@777:     // The order of these is important, as another thread might be
ysr@777:     // about to start scanning this region. If it does so after
ysr@777:     // set_saved_mark and before _gc_time_stamp = ..., then the latter
ysr@777:     // will be false, and it will pick up top() as the high water mark
ysr@777:     // of region. If it does so after _gc_time_stamp = ..., then it
ysr@777:     // will pick up the right saved_mark_word() as the high water mark
ysr@777:     // of the region. Either way, the behaviour will be correct.
ysr@777:     ContiguousSpace::set_saved_mark();
ysr@1280:     OrderAccess::storestore();
iveresov@788:     _gc_time_stamp = curr_gc_time_stamp;
tonyp@2715:     // No need to do another barrier to flush the writes above. If
tonyp@2715:     // this is called in parallel with other threads trying to
tonyp@2715:     // allocate into the region, the caller should call this while
tonyp@2715:     // holding a lock and when the lock is released the writes will be
tonyp@2715:     // flushed.
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: G1OffsetTableContigSpace::
ysr@777: G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray,
johnc@4065:                          MemRegion mr) :
ysr@777:   _offsets(sharedOffsetArray, mr),
ysr@777:   _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true),
ysr@777:   _gc_time_stamp(0)
ysr@777: {
ysr@777:   _offsets.set_space(this);
johnc@4065:   // false ==> we'll do the clearing if there's clearing to be done.
johnc@4065:   ContiguousSpace::initialize(mr, false, SpaceDecorator::Mangle);
johnc@4065:   _offsets.zero_bottom_entry();
johnc@4065:   _offsets.initialize_threshold();
ysr@777: }