| /* |
| * Copyright (c) 2017, 2019, Red Hat, Inc. All rights reserved. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| |
| #include "gc/shenandoah/shenandoahAsserts.hpp" |
| #include "gc/shenandoah/shenandoahForwarding.inline.hpp" |
| #include "gc/shenandoah/shenandoahPhaseTimings.hpp" |
| #include "gc/shenandoah/shenandoahHeap.inline.hpp" |
| #include "gc/shenandoah/shenandoahRootProcessor.hpp" |
| #include "gc/shenandoah/shenandoahTaskqueue.inline.hpp" |
| #include "gc/shenandoah/shenandoahUtils.hpp" |
| #include "gc/shenandoah/shenandoahVerifier.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/iterator.inline.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/compressedOops.inline.hpp" |
| |
| // Avoid name collision on verify_oop (defined in macroAssembler_arm.hpp) |
| #ifdef verify_oop |
| #undef verify_oop |
| #endif |
| |
| class ShenandoahVerifyOopClosure : public BasicOopIterateClosure { |
| private: |
| const char* _phase; |
| ShenandoahVerifier::VerifyOptions _options; |
| ShenandoahVerifierStack* _stack; |
| ShenandoahHeap* _heap; |
| MarkBitMap* _map; |
| ShenandoahLivenessData* _ld; |
| void* _interior_loc; |
| oop _loc; |
| |
| public: |
| ShenandoahVerifyOopClosure(ShenandoahVerifierStack* stack, MarkBitMap* map, ShenandoahLivenessData* ld, |
| const char* phase, ShenandoahVerifier::VerifyOptions options) : |
| _phase(phase), |
| _options(options), |
| _stack(stack), |
| _heap(ShenandoahHeap::heap()), |
| _map(map), |
| _ld(ld), |
| _interior_loc(NULL), |
| _loc(NULL) { } |
| |
| private: |
| void check(ShenandoahAsserts::SafeLevel level, oop obj, bool test, const char* label) { |
| if (!test) { |
| ShenandoahAsserts::print_failure(level, obj, _interior_loc, _loc, _phase, label, __FILE__, __LINE__); |
| } |
| } |
| |
| template <class T> |
| void do_oop_work(T* p) { |
| T o = RawAccess<>::oop_load(p); |
| if (!CompressedOops::is_null(o)) { |
| oop obj = CompressedOops::decode_not_null(o); |
| |
| // Single threaded verification can use faster non-atomic stack and bitmap |
| // methods. |
| // |
| // For performance reasons, only fully verify non-marked field values. |
| // We are here when the host object for *p is already marked. |
| |
| HeapWord* addr = (HeapWord*) obj; |
| if (_map->par_mark(addr)) { |
| verify_oop_at(p, obj); |
| _stack->push(ShenandoahVerifierTask(obj)); |
| } |
| } |
| } |
| |
| void verify_oop(oop obj) { |
| // Perform consistency checks with gradually decreasing safety level. This guarantees |
| // that failure report would not try to touch something that was not yet verified to be |
| // safe to process. |
| |
| check(ShenandoahAsserts::_safe_unknown, obj, _heap->is_in(obj), |
| "oop must be in heap"); |
| check(ShenandoahAsserts::_safe_unknown, obj, check_obj_alignment(obj), |
| "oop must be aligned"); |
| |
| ShenandoahHeapRegion *obj_reg = _heap->heap_region_containing(obj); |
| Klass* obj_klass = obj->klass_or_null(); |
| |
| // Verify that obj is not in dead space: |
| { |
| // Do this before touching obj->size() |
| check(ShenandoahAsserts::_safe_unknown, obj, obj_klass != NULL, |
| "Object klass pointer should not be NULL"); |
| check(ShenandoahAsserts::_safe_unknown, obj, Metaspace::contains(obj_klass), |
| "Object klass pointer must go to metaspace"); |
| |
| HeapWord *obj_addr = (HeapWord *) obj; |
| check(ShenandoahAsserts::_safe_unknown, obj, obj_addr < obj_reg->top(), |
| "Object start should be within the region"); |
| |
| if (!obj_reg->is_humongous()) { |
| check(ShenandoahAsserts::_safe_unknown, obj, (obj_addr + obj->size()) <= obj_reg->top(), |
| "Object end should be within the region"); |
| } else { |
| size_t humongous_start = obj_reg->region_number(); |
| size_t humongous_end = humongous_start + (obj->size() >> ShenandoahHeapRegion::region_size_words_shift()); |
| for (size_t idx = humongous_start + 1; idx < humongous_end; idx++) { |
| check(ShenandoahAsserts::_safe_unknown, obj, _heap->get_region(idx)->is_humongous_continuation(), |
| "Humongous object is in continuation that fits it"); |
| } |
| } |
| |
| // ------------ obj is safe at this point -------------- |
| |
| check(ShenandoahAsserts::_safe_oop, obj, obj_reg->is_active(), |
| "Object should be in active region"); |
| |
| switch (_options._verify_liveness) { |
| case ShenandoahVerifier::_verify_liveness_disable: |
| // skip |
| break; |
| case ShenandoahVerifier::_verify_liveness_complete: |
| Atomic::add((uint) obj->size(), &_ld[obj_reg->region_number()]); |
| // fallthrough for fast failure for un-live regions: |
| case ShenandoahVerifier::_verify_liveness_conservative: |
| check(ShenandoahAsserts::_safe_oop, obj, obj_reg->has_live(), |
| "Object must belong to region with live data"); |
| break; |
| default: |
| assert(false, "Unhandled liveness verification"); |
| } |
| } |
| |
| oop fwd = (oop) ShenandoahForwarding::get_forwardee_raw_unchecked(obj); |
| |
| ShenandoahHeapRegion* fwd_reg = NULL; |
| |
| if (!oopDesc::equals_raw(obj, fwd)) { |
| check(ShenandoahAsserts::_safe_oop, obj, _heap->is_in(fwd), |
| "Forwardee must be in heap"); |
| check(ShenandoahAsserts::_safe_oop, obj, !CompressedOops::is_null(fwd), |
| "Forwardee is set"); |
| check(ShenandoahAsserts::_safe_oop, obj, check_obj_alignment(fwd), |
| "Forwardee must be aligned"); |
| |
| // Do this before touching fwd->size() |
| Klass* fwd_klass = fwd->klass_or_null(); |
| check(ShenandoahAsserts::_safe_oop, obj, fwd_klass != NULL, |
| "Forwardee klass pointer should not be NULL"); |
| check(ShenandoahAsserts::_safe_oop, obj, Metaspace::contains(fwd_klass), |
| "Forwardee klass pointer must go to metaspace"); |
| check(ShenandoahAsserts::_safe_oop, obj, obj_klass == fwd_klass, |
| "Forwardee klass pointer must go to metaspace"); |
| |
| fwd_reg = _heap->heap_region_containing(fwd); |
| |
| // Verify that forwardee is not in the dead space: |
| check(ShenandoahAsserts::_safe_oop, obj, !fwd_reg->is_humongous(), |
| "Should have no humongous forwardees"); |
| |
| HeapWord *fwd_addr = (HeapWord *) fwd; |
| check(ShenandoahAsserts::_safe_oop, obj, fwd_addr < fwd_reg->top(), |
| "Forwardee start should be within the region"); |
| check(ShenandoahAsserts::_safe_oop, obj, (fwd_addr + fwd->size()) <= fwd_reg->top(), |
| "Forwardee end should be within the region"); |
| |
| oop fwd2 = (oop) ShenandoahForwarding::get_forwardee_raw_unchecked(fwd); |
| check(ShenandoahAsserts::_safe_oop, obj, oopDesc::equals_raw(fwd, fwd2), |
| "Double forwarding"); |
| } else { |
| fwd_reg = obj_reg; |
| } |
| |
| // ------------ obj and fwd are safe at this point -------------- |
| |
| switch (_options._verify_marked) { |
| case ShenandoahVerifier::_verify_marked_disable: |
| // skip |
| break; |
| case ShenandoahVerifier::_verify_marked_incomplete: |
| check(ShenandoahAsserts::_safe_all, obj, _heap->marking_context()->is_marked(obj), |
| "Must be marked in incomplete bitmap"); |
| break; |
| case ShenandoahVerifier::_verify_marked_complete: |
| check(ShenandoahAsserts::_safe_all, obj, _heap->complete_marking_context()->is_marked(obj), |
| "Must be marked in complete bitmap"); |
| break; |
| default: |
| assert(false, "Unhandled mark verification"); |
| } |
| |
| switch (_options._verify_forwarded) { |
| case ShenandoahVerifier::_verify_forwarded_disable: |
| // skip |
| break; |
| case ShenandoahVerifier::_verify_forwarded_none: { |
| check(ShenandoahAsserts::_safe_all, obj, oopDesc::equals_raw(obj, fwd), |
| "Should not be forwarded"); |
| break; |
| } |
| case ShenandoahVerifier::_verify_forwarded_allow: { |
| if (!oopDesc::equals_raw(obj, fwd)) { |
| check(ShenandoahAsserts::_safe_all, obj, obj_reg != fwd_reg, |
| "Forwardee should be in another region"); |
| } |
| break; |
| } |
| default: |
| assert(false, "Unhandled forwarding verification"); |
| } |
| |
| switch (_options._verify_cset) { |
| case ShenandoahVerifier::_verify_cset_disable: |
| // skip |
| break; |
| case ShenandoahVerifier::_verify_cset_none: |
| check(ShenandoahAsserts::_safe_all, obj, !_heap->in_collection_set(obj), |
| "Should not have references to collection set"); |
| break; |
| case ShenandoahVerifier::_verify_cset_forwarded: |
| if (_heap->in_collection_set(obj)) { |
| check(ShenandoahAsserts::_safe_all, obj, !oopDesc::equals_raw(obj, fwd), |
| "Object in collection set, should have forwardee"); |
| } |
| break; |
| default: |
| assert(false, "Unhandled cset verification"); |
| } |
| |
| } |
| |
| public: |
| /** |
| * Verify object with known interior reference. |
| * @param p interior reference where the object is referenced from; can be off-heap |
| * @param obj verified object |
| */ |
| template <class T> |
| void verify_oop_at(T* p, oop obj) { |
| _interior_loc = p; |
| verify_oop(obj); |
| _interior_loc = NULL; |
| } |
| |
| /** |
| * Verify object without known interior reference. |
| * Useful when picking up the object at known offset in heap, |
| * but without knowing what objects reference it. |
| * @param obj verified object |
| */ |
| void verify_oop_standalone(oop obj) { |
| _interior_loc = NULL; |
| verify_oop(obj); |
| _interior_loc = NULL; |
| } |
| |
| /** |
| * Verify oop fields from this object. |
| * @param obj host object for verified fields |
| */ |
| void verify_oops_from(oop obj) { |
| _loc = obj; |
| obj->oop_iterate(this); |
| _loc = NULL; |
| } |
| |
| virtual void do_oop(oop* p) { do_oop_work(p); } |
| virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
| }; |
| |
| class ShenandoahCalculateRegionStatsClosure : public ShenandoahHeapRegionClosure { |
| private: |
| size_t _used, _committed, _garbage; |
| public: |
| ShenandoahCalculateRegionStatsClosure() : _used(0), _committed(0), _garbage(0) {}; |
| |
| void heap_region_do(ShenandoahHeapRegion* r) { |
| _used += r->used(); |
| _garbage += r->garbage(); |
| _committed += r->is_committed() ? ShenandoahHeapRegion::region_size_bytes() : 0; |
| } |
| |
| size_t used() { return _used; } |
| size_t committed() { return _committed; } |
| size_t garbage() { return _garbage; } |
| }; |
| |
| class ShenandoahVerifyHeapRegionClosure : public ShenandoahHeapRegionClosure { |
| private: |
| ShenandoahHeap* _heap; |
| const char* _phase; |
| ShenandoahVerifier::VerifyRegions _regions; |
| public: |
| ShenandoahVerifyHeapRegionClosure(const char* phase, ShenandoahVerifier::VerifyRegions regions) : |
| _heap(ShenandoahHeap::heap()), |
| _phase(phase), |
| _regions(regions) {}; |
| |
| void print_failure(ShenandoahHeapRegion* r, const char* label) { |
| ResourceMark rm; |
| |
| ShenandoahMessageBuffer msg("Shenandoah verification failed; %s: %s\n\n", _phase, label); |
| |
| stringStream ss; |
| r->print_on(&ss); |
| msg.append("%s", ss.as_string()); |
| |
| report_vm_error(__FILE__, __LINE__, msg.buffer()); |
| } |
| |
| void verify(ShenandoahHeapRegion* r, bool test, const char* msg) { |
| if (!test) { |
| print_failure(r, msg); |
| } |
| } |
| |
| void heap_region_do(ShenandoahHeapRegion* r) { |
| switch (_regions) { |
| case ShenandoahVerifier::_verify_regions_disable: |
| break; |
| case ShenandoahVerifier::_verify_regions_notrash: |
| verify(r, !r->is_trash(), |
| "Should not have trash regions"); |
| break; |
| case ShenandoahVerifier::_verify_regions_nocset: |
| verify(r, !r->is_cset(), |
| "Should not have cset regions"); |
| break; |
| case ShenandoahVerifier::_verify_regions_notrash_nocset: |
| verify(r, !r->is_trash(), |
| "Should not have trash regions"); |
| verify(r, !r->is_cset(), |
| "Should not have cset regions"); |
| break; |
| default: |
| ShouldNotReachHere(); |
| } |
| |
| verify(r, r->capacity() == ShenandoahHeapRegion::region_size_bytes(), |
| "Capacity should match region size"); |
| |
| verify(r, r->bottom() <= r->top(), |
| "Region top should not be less than bottom"); |
| |
| verify(r, r->bottom() <= _heap->marking_context()->top_at_mark_start(r), |
| "Region TAMS should not be less than bottom"); |
| |
| verify(r, _heap->marking_context()->top_at_mark_start(r) <= r->top(), |
| "Complete TAMS should not be larger than top"); |
| |
| verify(r, r->get_live_data_bytes() <= r->capacity(), |
| "Live data cannot be larger than capacity"); |
| |
| verify(r, r->garbage() <= r->capacity(), |
| "Garbage cannot be larger than capacity"); |
| |
| verify(r, r->used() <= r->capacity(), |
| "Used cannot be larger than capacity"); |
| |
| verify(r, r->get_shared_allocs() <= r->capacity(), |
| "Shared alloc count should not be larger than capacity"); |
| |
| verify(r, r->get_tlab_allocs() <= r->capacity(), |
| "TLAB alloc count should not be larger than capacity"); |
| |
| verify(r, r->get_gclab_allocs() <= r->capacity(), |
| "GCLAB alloc count should not be larger than capacity"); |
| |
| verify(r, r->get_shared_allocs() + r->get_tlab_allocs() + r->get_gclab_allocs() == r->used(), |
| "Accurate accounting: shared + TLAB + GCLAB = used"); |
| |
| verify(r, !r->is_empty() || !r->has_live(), |
| "Empty regions should not have live data"); |
| |
| verify(r, r->is_cset() == _heap->collection_set()->is_in(r), |
| "Transitional: region flags and collection set agree"); |
| |
| verify(r, r->is_empty() || r->seqnum_first_alloc() != 0, |
| "Non-empty regions should have first seqnum set"); |
| |
| verify(r, r->is_empty() || (r->seqnum_first_alloc_mutator() != 0 || r->seqnum_first_alloc_gc() != 0), |
| "Non-empty regions should have first seqnum set to either GC or mutator"); |
| |
| verify(r, r->is_empty() || r->seqnum_last_alloc() != 0, |
| "Non-empty regions should have last seqnum set"); |
| |
| verify(r, r->is_empty() || (r->seqnum_last_alloc_mutator() != 0 || r->seqnum_last_alloc_gc() != 0), |
| "Non-empty regions should have last seqnum set to either GC or mutator"); |
| |
| verify(r, r->seqnum_first_alloc() <= r->seqnum_last_alloc(), |
| "First seqnum should not be greater than last timestamp"); |
| |
| verify(r, r->seqnum_first_alloc_mutator() <= r->seqnum_last_alloc_mutator(), |
| "First mutator seqnum should not be greater than last seqnum"); |
| |
| verify(r, r->seqnum_first_alloc_gc() <= r->seqnum_last_alloc_gc(), |
| "First GC seqnum should not be greater than last seqnum"); |
| } |
| }; |
| |
| class ShenandoahVerifierReachableTask : public AbstractGangTask { |
| private: |
| const char* _label; |
| ShenandoahRootVerifier* _verifier; |
| ShenandoahVerifier::VerifyOptions _options; |
| ShenandoahHeap* _heap; |
| ShenandoahLivenessData* _ld; |
| MarkBitMap* _bitmap; |
| volatile size_t _processed; |
| |
| public: |
| ShenandoahVerifierReachableTask(MarkBitMap* bitmap, |
| ShenandoahLivenessData* ld, |
| ShenandoahRootVerifier* verifier, |
| const char* label, |
| ShenandoahVerifier::VerifyOptions options) : |
| AbstractGangTask("Shenandoah Parallel Verifier Reachable Task"), |
| _label(label), |
| _verifier(verifier), |
| _options(options), |
| _heap(ShenandoahHeap::heap()), |
| _ld(ld), |
| _bitmap(bitmap), |
| _processed(0) {}; |
| |
| size_t processed() { |
| return _processed; |
| } |
| |
| virtual void work(uint worker_id) { |
| ResourceMark rm; |
| ShenandoahVerifierStack stack; |
| |
| // On level 2, we need to only check the roots once. |
| // On level 3, we want to check the roots, and seed the local stack. |
| // It is a lesser evil to accept multiple root scans at level 3, because |
| // extended parallelism would buy us out. |
| if (((ShenandoahVerifyLevel == 2) && (worker_id == 0)) |
| || (ShenandoahVerifyLevel >= 3)) { |
| ShenandoahVerifyOopClosure cl(&stack, _bitmap, _ld, |
| ShenandoahMessageBuffer("%s, Roots", _label), |
| _options); |
| if (_heap->unload_classes()) { |
| _verifier->strong_roots_do(&cl); |
| } else { |
| _verifier->roots_do(&cl); |
| } |
| } |
| |
| size_t processed = 0; |
| |
| if (ShenandoahVerifyLevel >= 3) { |
| ShenandoahVerifyOopClosure cl(&stack, _bitmap, _ld, |
| ShenandoahMessageBuffer("%s, Reachable", _label), |
| _options); |
| while (!stack.is_empty()) { |
| processed++; |
| ShenandoahVerifierTask task = stack.pop(); |
| cl.verify_oops_from(task.obj()); |
| } |
| } |
| |
| Atomic::add(processed, &_processed); |
| } |
| }; |
| |
| class ShenandoahVerifierMarkedRegionTask : public AbstractGangTask { |
| private: |
| const char* _label; |
| ShenandoahVerifier::VerifyOptions _options; |
| ShenandoahHeap *_heap; |
| MarkBitMap* _bitmap; |
| ShenandoahLivenessData* _ld; |
| volatile size_t _claimed; |
| volatile size_t _processed; |
| |
| public: |
| ShenandoahVerifierMarkedRegionTask(MarkBitMap* bitmap, |
| ShenandoahLivenessData* ld, |
| const char* label, |
| ShenandoahVerifier::VerifyOptions options) : |
| AbstractGangTask("Shenandoah Parallel Verifier Marked Region"), |
| _label(label), |
| _options(options), |
| _heap(ShenandoahHeap::heap()), |
| _bitmap(bitmap), |
| _ld(ld), |
| _claimed(0), |
| _processed(0) {}; |
| |
| size_t processed() { |
| return _processed; |
| } |
| |
| virtual void work(uint worker_id) { |
| ShenandoahVerifierStack stack; |
| ShenandoahVerifyOopClosure cl(&stack, _bitmap, _ld, |
| ShenandoahMessageBuffer("%s, Marked", _label), |
| _options); |
| |
| while (true) { |
| size_t v = Atomic::add(1u, &_claimed) - 1; |
| if (v < _heap->num_regions()) { |
| ShenandoahHeapRegion* r = _heap->get_region(v); |
| if (!r->is_humongous() && !r->is_trash()) { |
| work_regular(r, stack, cl); |
| } else if (r->is_humongous_start()) { |
| work_humongous(r, stack, cl); |
| } |
| } else { |
| break; |
| } |
| } |
| } |
| |
| virtual void work_humongous(ShenandoahHeapRegion *r, ShenandoahVerifierStack& stack, ShenandoahVerifyOopClosure& cl) { |
| size_t processed = 0; |
| HeapWord* obj = r->bottom(); |
| if (_heap->complete_marking_context()->is_marked((oop)obj)) { |
| verify_and_follow(obj, stack, cl, &processed); |
| } |
| Atomic::add(processed, &_processed); |
| } |
| |
| virtual void work_regular(ShenandoahHeapRegion *r, ShenandoahVerifierStack &stack, ShenandoahVerifyOopClosure &cl) { |
| size_t processed = 0; |
| MarkBitMap* mark_bit_map = _heap->complete_marking_context()->mark_bit_map(); |
| HeapWord* tams = _heap->complete_marking_context()->top_at_mark_start(r); |
| |
| // Bitmaps, before TAMS |
| if (tams > r->bottom()) { |
| HeapWord* start = r->bottom(); |
| HeapWord* addr = mark_bit_map->get_next_marked_addr(start, tams); |
| |
| while (addr < tams) { |
| verify_and_follow(addr, stack, cl, &processed); |
| addr += 1; |
| if (addr < tams) { |
| addr = mark_bit_map->get_next_marked_addr(addr, tams); |
| } |
| } |
| } |
| |
| // Size-based, after TAMS |
| { |
| HeapWord* limit = r->top(); |
| HeapWord* addr = tams; |
| |
| while (addr < limit) { |
| verify_and_follow(addr, stack, cl, &processed); |
| addr += oop(addr)->size(); |
| } |
| } |
| |
| Atomic::add(processed, &_processed); |
| } |
| |
| void verify_and_follow(HeapWord *addr, ShenandoahVerifierStack &stack, ShenandoahVerifyOopClosure &cl, size_t *processed) { |
| if (!_bitmap->par_mark(addr)) return; |
| |
| // Verify the object itself: |
| oop obj = oop(addr); |
| cl.verify_oop_standalone(obj); |
| |
| // Verify everything reachable from that object too, hopefully realizing |
| // everything was already marked, and never touching further: |
| cl.verify_oops_from(obj); |
| (*processed)++; |
| |
| while (!stack.is_empty()) { |
| ShenandoahVerifierTask task = stack.pop(); |
| cl.verify_oops_from(task.obj()); |
| (*processed)++; |
| } |
| } |
| }; |
| |
| class VerifyThreadGCState : public ThreadClosure { |
| private: |
| const char* _label; |
| char _expected; |
| |
| public: |
| VerifyThreadGCState(const char* label, char expected) : _expected(expected) {} |
| void do_thread(Thread* t) { |
| char actual = ShenandoahThreadLocalData::gc_state(t); |
| if (actual != _expected) { |
| fatal("%s: Thread %s: expected gc-state %d, actual %d", _label, t->name(), _expected, actual); |
| } |
| } |
| }; |
| |
| class ShenandoahGCStateResetter : public StackObj { |
| private: |
| ShenandoahHeap* const _heap; |
| char _gc_state; |
| |
| public: |
| ShenandoahGCStateResetter() : _heap(ShenandoahHeap::heap()) { |
| _gc_state = _heap->gc_state(); |
| _heap->_gc_state.clear(); |
| } |
| |
| ~ShenandoahGCStateResetter() { |
| _heap->_gc_state.set(_gc_state); |
| assert(_heap->gc_state() == _gc_state, "Should be restored"); |
| } |
| }; |
| |
| void ShenandoahVerifier::verify_at_safepoint(const char *label, |
| VerifyForwarded forwarded, VerifyMarked marked, |
| VerifyCollectionSet cset, |
| VerifyLiveness liveness, VerifyRegions regions, |
| VerifyGCState gcstate) { |
| guarantee(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "only when nothing else happens"); |
| guarantee(ShenandoahVerify, "only when enabled, and bitmap is initialized in ShenandoahHeap::initialize"); |
| |
| // Avoid side-effect of changing workers' active thread count, but bypass concurrent/parallel protocol check |
| ShenandoahPushWorkerScope verify_worker_scope(_heap->workers(), _heap->max_workers(), false /*bypass check*/); |
| |
| log_info(gc,start)("Verify %s, Level " INTX_FORMAT, label, ShenandoahVerifyLevel); |
| |
| // GC state checks |
| { |
| char expected = -1; |
| bool enabled; |
| switch (gcstate) { |
| case _verify_gcstate_disable: |
| enabled = false; |
| break; |
| case _verify_gcstate_forwarded: |
| enabled = true; |
| expected = ShenandoahHeap::HAS_FORWARDED; |
| break; |
| case _verify_gcstate_evacuation: |
| enabled = true; |
| expected = ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::EVACUATION; |
| break; |
| case _verify_gcstate_stable: |
| enabled = true; |
| expected = ShenandoahHeap::STABLE; |
| break; |
| default: |
| enabled = false; |
| assert(false, "Unhandled gc-state verification"); |
| } |
| |
| if (enabled) { |
| char actual = _heap->gc_state(); |
| if (actual != expected) { |
| fatal("%s: Global gc-state: expected %d, actual %d", label, expected, actual); |
| } |
| |
| VerifyThreadGCState vtgcs(label, expected); |
| Threads::java_threads_do(&vtgcs); |
| } |
| } |
| |
| // Deactivate barriers temporarily: Verifier wants plain heap accesses |
| ShenandoahGCStateResetter resetter; |
| |
| // Heap size checks |
| { |
| ShenandoahHeapLocker lock(_heap->lock()); |
| |
| ShenandoahCalculateRegionStatsClosure cl; |
| _heap->heap_region_iterate(&cl); |
| size_t heap_used = _heap->used(); |
| guarantee(cl.used() == heap_used, |
| "%s: heap used size must be consistent: heap-used = " SIZE_FORMAT "K, regions-used = " SIZE_FORMAT "K", |
| label, heap_used/K, cl.used()/K); |
| |
| size_t heap_committed = _heap->committed(); |
| guarantee(cl.committed() == heap_committed, |
| "%s: heap committed size must be consistent: heap-committed = " SIZE_FORMAT "K, regions-committed = " SIZE_FORMAT "K", |
| label, heap_committed/K, cl.committed()/K); |
| } |
| |
| // Internal heap region checks |
| if (ShenandoahVerifyLevel >= 1) { |
| ShenandoahVerifyHeapRegionClosure cl(label, regions); |
| _heap->heap_region_iterate(&cl); |
| } |
| |
| OrderAccess::fence(); |
| _heap->make_parsable(false); |
| |
| // Allocate temporary bitmap for storing marking wavefront: |
| _verification_bit_map->clear(); |
| |
| // Allocate temporary array for storing liveness data |
| ShenandoahLivenessData* ld = NEW_C_HEAP_ARRAY(ShenandoahLivenessData, _heap->num_regions(), mtGC); |
| Copy::fill_to_bytes((void*)ld, _heap->num_regions()*sizeof(ShenandoahLivenessData), 0); |
| |
| const VerifyOptions& options = ShenandoahVerifier::VerifyOptions(forwarded, marked, cset, liveness, regions, gcstate); |
| |
| // Steps 1-2. Scan root set to get initial reachable set. Finish walking the reachable heap. |
| // This verifies what application can see, since it only cares about reachable objects. |
| size_t count_reachable = 0; |
| if (ShenandoahVerifyLevel >= 2) { |
| ShenandoahRootVerifier verifier; |
| |
| ShenandoahVerifierReachableTask task(_verification_bit_map, ld, &verifier, label, options); |
| _heap->workers()->run_task(&task); |
| count_reachable = task.processed(); |
| } |
| |
| // Step 3. Walk marked objects. Marked objects might be unreachable. This verifies what collector, |
| // not the application, can see during the region scans. There is no reason to process the objects |
| // that were already verified, e.g. those marked in verification bitmap. There is interaction with TAMS: |
| // before TAMS, we verify the bitmaps, if available; after TAMS, we walk until the top(). It mimics |
| // what marked_object_iterate is doing, without calling into that optimized (and possibly incorrect) |
| // version |
| |
| size_t count_marked = 0; |
| if (ShenandoahVerifyLevel >= 4 && marked == _verify_marked_complete) { |
| guarantee(_heap->marking_context()->is_complete(), "Marking context should be complete"); |
| ShenandoahVerifierMarkedRegionTask task(_verification_bit_map, ld, label, options); |
| _heap->workers()->run_task(&task); |
| count_marked = task.processed(); |
| } else { |
| guarantee(ShenandoahVerifyLevel < 4 || marked == _verify_marked_incomplete || marked == _verify_marked_disable, "Should be"); |
| } |
| |
| // Step 4. Verify accumulated liveness data, if needed. Only reliable if verification level includes |
| // marked objects. |
| |
| if (ShenandoahVerifyLevel >= 4 && marked == _verify_marked_complete && liveness == _verify_liveness_complete) { |
| for (size_t i = 0; i < _heap->num_regions(); i++) { |
| ShenandoahHeapRegion* r = _heap->get_region(i); |
| |
| juint verf_live = 0; |
| if (r->is_humongous()) { |
| // For humongous objects, test if start region is marked live, and if so, |
| // all humongous regions in that chain have live data equal to their "used". |
| juint start_live = OrderAccess::load_acquire(&ld[r->humongous_start_region()->region_number()]); |
| if (start_live > 0) { |
| verf_live = (juint)(r->used() / HeapWordSize); |
| } |
| } else { |
| verf_live = OrderAccess::load_acquire(&ld[r->region_number()]); |
| } |
| |
| size_t reg_live = r->get_live_data_words(); |
| if (reg_live != verf_live) { |
| ResourceMark rm; |
| stringStream ss; |
| r->print_on(&ss); |
| fatal("%s: Live data should match: region-live = " SIZE_FORMAT ", verifier-live = " UINT32_FORMAT "\n%s", |
| label, reg_live, verf_live, ss.as_string()); |
| } |
| } |
| } |
| |
| log_info(gc)("Verify %s, Level " INTX_FORMAT " (" SIZE_FORMAT " reachable, " SIZE_FORMAT " marked)", |
| label, ShenandoahVerifyLevel, count_reachable, count_marked); |
| |
| FREE_C_HEAP_ARRAY(ShenandoahLivenessData, ld); |
| } |
| |
| void ShenandoahVerifier::verify_generic(VerifyOption vo) { |
| verify_at_safepoint( |
| "Generic Verification", |
| _verify_forwarded_allow, // conservatively allow forwarded |
| _verify_marked_disable, // do not verify marked: lots ot time wasted checking dead allocations |
| _verify_cset_disable, // cset may be inconsistent |
| _verify_liveness_disable, // no reliable liveness data |
| _verify_regions_disable, // no reliable region data |
| _verify_gcstate_disable // no data about gcstate |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_before_concmark() { |
| if (_heap->has_forwarded_objects()) { |
| verify_at_safepoint( |
| "Before Mark", |
| _verify_forwarded_allow, // may have forwarded references |
| _verify_marked_disable, // do not verify marked: lots ot time wasted checking dead allocations |
| _verify_cset_forwarded, // allow forwarded references to cset |
| _verify_liveness_disable, // no reliable liveness data |
| _verify_regions_notrash, // no trash regions |
| _verify_gcstate_forwarded // there are forwarded objects |
| ); |
| } else { |
| verify_at_safepoint( |
| "Before Mark", |
| _verify_forwarded_none, // UR should have fixed up |
| _verify_marked_disable, // do not verify marked: lots ot time wasted checking dead allocations |
| _verify_cset_none, // UR should have fixed this |
| _verify_liveness_disable, // no reliable liveness data |
| _verify_regions_notrash, // no trash regions |
| _verify_gcstate_stable // there are no forwarded objects |
| ); |
| } |
| } |
| |
| void ShenandoahVerifier::verify_after_concmark() { |
| verify_at_safepoint( |
| "After Mark", |
| _verify_forwarded_none, // no forwarded references |
| _verify_marked_complete, // bitmaps as precise as we can get |
| _verify_cset_none, // no references to cset anymore |
| _verify_liveness_complete, // liveness data must be complete here |
| _verify_regions_disable, // trash regions not yet recycled |
| _verify_gcstate_stable // mark should have stabilized the heap |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_before_evacuation() { |
| verify_at_safepoint( |
| "Before Evacuation", |
| _verify_forwarded_none, // no forwarded references |
| _verify_marked_complete, // walk over marked objects too |
| _verify_cset_disable, // non-forwarded references to cset expected |
| _verify_liveness_complete, // liveness data must be complete here |
| _verify_regions_disable, // trash regions not yet recycled |
| _verify_gcstate_stable // mark should have stabilized the heap |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_during_evacuation() { |
| verify_at_safepoint( |
| "During Evacuation", |
| _verify_forwarded_allow, // some forwarded references are allowed |
| _verify_marked_disable, // walk only roots |
| _verify_cset_disable, // some cset references are not forwarded yet |
| _verify_liveness_disable, // liveness data might be already stale after pre-evacs |
| _verify_regions_disable, // trash regions not yet recycled |
| _verify_gcstate_evacuation // evacuation is in progress |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_after_evacuation() { |
| verify_at_safepoint( |
| "After Evacuation", |
| _verify_forwarded_allow, // objects are still forwarded |
| _verify_marked_complete, // bitmaps might be stale, but alloc-after-mark should be well |
| _verify_cset_forwarded, // all cset refs are fully forwarded |
| _verify_liveness_disable, // no reliable liveness data anymore |
| _verify_regions_notrash, // trash regions have been recycled already |
| _verify_gcstate_forwarded // evacuation produced some forwarded objects |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_before_updaterefs() { |
| verify_at_safepoint( |
| "Before Updating References", |
| _verify_forwarded_allow, // forwarded references allowed |
| _verify_marked_complete, // bitmaps might be stale, but alloc-after-mark should be well |
| _verify_cset_forwarded, // all cset refs are fully forwarded |
| _verify_liveness_disable, // no reliable liveness data anymore |
| _verify_regions_notrash, // trash regions have been recycled already |
| _verify_gcstate_forwarded // evacuation should have produced some forwarded objects |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_after_updaterefs() { |
| verify_at_safepoint( |
| "After Updating References", |
| _verify_forwarded_none, // no forwarded references |
| _verify_marked_complete, // bitmaps might be stale, but alloc-after-mark should be well |
| _verify_cset_none, // no cset references, all updated |
| _verify_liveness_disable, // no reliable liveness data anymore |
| _verify_regions_nocset, // no cset regions, trash regions have appeared |
| _verify_gcstate_stable // update refs had cleaned up forwarded objects |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_after_degenerated() { |
| verify_at_safepoint( |
| "After Degenerated GC", |
| _verify_forwarded_none, // all objects are non-forwarded |
| _verify_marked_complete, // all objects are marked in complete bitmap |
| _verify_cset_none, // no cset references |
| _verify_liveness_disable, // no reliable liveness data anymore |
| _verify_regions_notrash_nocset, // no trash, no cset |
| _verify_gcstate_stable // degenerated refs had cleaned up forwarded objects |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_before_traversal() { |
| verify_at_safepoint( |
| "Before Traversal", |
| _verify_forwarded_none, // cannot have forwarded objects |
| _verify_marked_disable, // bitmaps are not relevant before traversal |
| _verify_cset_none, // no cset references before traversal |
| _verify_liveness_disable, // no reliable liveness data anymore |
| _verify_regions_notrash_nocset, // no trash and no cset regions |
| _verify_gcstate_stable // nothing forwarded before traversal |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_after_traversal() { |
| verify_at_safepoint( |
| "After Traversal", |
| _verify_forwarded_none, // cannot have forwarded objects |
| _verify_marked_complete, // should have complete marking after traversal |
| _verify_cset_none, // no cset references left after traversal |
| _verify_liveness_disable, // liveness data is not collected for new allocations |
| _verify_regions_nocset, // no cset regions, trash regions allowed |
| _verify_gcstate_stable // nothing forwarded after traversal |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_before_fullgc() { |
| verify_at_safepoint( |
| "Before Full GC", |
| _verify_forwarded_allow, // can have forwarded objects |
| _verify_marked_disable, // do not verify marked: lots ot time wasted checking dead allocations |
| _verify_cset_disable, // cset might be foobared |
| _verify_liveness_disable, // no reliable liveness data anymore |
| _verify_regions_disable, // no reliable region data here |
| _verify_gcstate_disable // no reliable gcstate data |
| ); |
| } |
| |
| void ShenandoahVerifier::verify_after_fullgc() { |
| verify_at_safepoint( |
| "After Full GC", |
| _verify_forwarded_none, // all objects are non-forwarded |
| _verify_marked_complete, // all objects are marked in complete bitmap |
| _verify_cset_none, // no cset references |
| _verify_liveness_disable, // no reliable liveness data anymore |
| _verify_regions_notrash_nocset, // no trash, no cset |
| _verify_gcstate_stable // full gc cleaned up everything |
| ); |
| } |
| |
| class ShenandoahVerifyNoForwared : public OopClosure { |
| private: |
| template <class T> |
| void do_oop_work(T* p) { |
| T o = RawAccess<>::oop_load(p); |
| if (!CompressedOops::is_null(o)) { |
| oop obj = CompressedOops::decode_not_null(o); |
| oop fwd = (oop) ShenandoahForwarding::get_forwardee_raw_unchecked(obj); |
| if (!oopDesc::equals_raw(obj, fwd)) { |
| ShenandoahAsserts::print_failure(ShenandoahAsserts::_safe_all, obj, p, NULL, |
| "Verify Roots", "Should not be forwarded", __FILE__, __LINE__); |
| } |
| } |
| } |
| |
| public: |
| void do_oop(narrowOop* p) { do_oop_work(p); } |
| void do_oop(oop* p) { do_oop_work(p); } |
| }; |
| |
| void ShenandoahVerifier::verify_roots_no_forwarded() { |
| guarantee(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "only when nothing else happens"); |
| ShenandoahRootVerifier verifier; |
| ShenandoahVerifyNoForwared cl; |
| verifier.oops_do(&cl); |
| } |
| |
| void ShenandoahVerifier::verify_roots_no_forwarded_except(ShenandoahRootVerifier::RootTypes types) { |
| guarantee(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "only when nothing else happens"); |
| ShenandoahRootVerifier verifier; |
| verifier.excludes(types); |
| ShenandoahVerifyNoForwared cl; |
| verifier.oops_do(&cl); |
| } |