8147814: Move verification code out of g1collectedheap
Reviewed-by: jwilhelm, tschatzl
--- a/hotspot/src/share/vm/gc/g1/concurrentMark.cpp Wed Jan 27 05:59:31 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/concurrentMark.cpp Tue Jan 26 15:28:31 2016 +0100
@@ -31,6 +31,7 @@
#include "gc/g1/g1CollectedHeap.inline.hpp"
#include "gc/g1/g1CollectorPolicy.hpp"
#include "gc/g1/g1CollectorState.hpp"
+#include "gc/g1/g1HeapVerifier.hpp"
#include "gc/g1/g1OopClosures.inline.hpp"
#include "gc/g1/g1StringDedup.hpp"
#include "gc/g1/heapRegion.inline.hpp"
@@ -1062,7 +1063,7 @@
g1h->prepare_for_verify();
Universe::verify(VerifyOption_G1UsePrevMarking, "During GC (before)");
}
- g1h->check_bitmaps("Remark Start");
+ g1h->verifier()->check_bitmaps("Remark Start");
G1CollectorPolicy* g1p = g1h->g1_policy();
g1p->record_concurrent_mark_remark_start();
@@ -1111,7 +1112,7 @@
g1h->prepare_for_verify();
Universe::verify(VerifyOption_G1UseNextMarking, "During GC (after)");
}
- g1h->check_bitmaps("Remark End");
+ g1h->verifier()->check_bitmaps("Remark End");
assert(!restart_for_overflow(), "sanity");
// Completely reset the marking state since marking completed
set_non_marking_state();
@@ -1605,14 +1606,14 @@
return;
}
- g1h->verify_region_sets_optional();
+ g1h->verifier()->verify_region_sets_optional();
if (VerifyDuringGC) {
HandleMark hm; // handle scope
g1h->prepare_for_verify();
Universe::verify(VerifyOption_G1UsePrevMarking, "During GC (before)");
}
- g1h->check_bitmaps("Cleanup Start");
+ g1h->verifier()->check_bitmaps("Cleanup Start");
G1CollectorPolicy* g1p = g1h->g1_policy();
g1p->record_concurrent_mark_cleanup_start();
@@ -1702,9 +1703,9 @@
Universe::verify(VerifyOption_G1UsePrevMarking, "During GC (after)");
}
- g1h->check_bitmaps("Cleanup End");
-
- g1h->verify_region_sets_optional();
+ g1h->verifier()->check_bitmaps("Cleanup End");
+
+ g1h->verifier()->verify_region_sets_optional();
// We need to make this be a "collection" so any collection pause that
// races with it goes around and waits for completeCleanup to finish.
--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp Wed Jan 27 05:59:31 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.cpp Tue Jan 26 15:28:31 2016 +0100
@@ -38,6 +38,7 @@
#include "gc/g1/g1CollectorState.hpp"
#include "gc/g1/g1EvacStats.inline.hpp"
#include "gc/g1/g1GCPhaseTimes.hpp"
+#include "gc/g1/g1HeapVerifier.hpp"
#include "gc/g1/g1MarkSweep.hpp"
#include "gc/g1/g1OopClosures.inline.hpp"
#include "gc/g1/g1ParScanThreadState.inline.hpp"
@@ -399,7 +400,7 @@
assert(hr->bottom() < obj_top && obj_top <= hr->end(),
"obj_top should be in last region");
- check_bitmaps("Humongous Region Allocation", first_hr);
+ _verifier->check_bitmaps("Humongous Region Allocation", first_hr);
assert(words_not_fillable == 0 ||
first_hr->bottom() + word_size_sum - words_not_fillable == hr->top(),
@@ -427,7 +428,7 @@
HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size, AllocationContext_t context) {
assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */);
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
uint first = G1_NO_HRM_INDEX;
uint obj_regions = (uint) humongous_obj_size_in_regions(word_size);
@@ -501,7 +502,7 @@
g1mm()->update_sizes();
}
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
return result;
}
@@ -1230,7 +1231,7 @@
size_t metadata_prev_used = MetaspaceAux::used_bytes();
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
const bool do_clear_all_soft_refs = clear_all_soft_refs ||
collector_policy()->should_clear_all_soft_refs();
@@ -1271,9 +1272,9 @@
assert(used() == recalculate_used(), "Should be equal");
- verify_before_gc();
-
- check_bitmaps("Full GC Start");
+ _verifier->verify_before_gc();
+
+ _verifier->check_bitmaps("Full GC Start");
pre_full_gc_dump(gc_timer);
#if defined(COMPILER2) || INCLUDE_JVMCI
@@ -1408,9 +1409,9 @@
increment_old_marking_cycles_completed(false /* concurrent */);
_hrm.verify_optional();
- verify_region_sets_optional();
-
- verify_after_gc();
+ _verifier->verify_region_sets_optional();
+
+ _verifier->verify_after_gc();
// Clear the previous marking bitmap, if needed for bitmap verification.
// Note we cannot do this when we clear the next marking bitmap in
@@ -1422,7 +1423,7 @@
if (G1VerifyBitmaps) {
((CMBitMap*) concurrent_mark()->prevMarkBitMap())->clearAll();
}
- check_bitmaps("Full GC End");
+ _verifier->check_bitmaps("Full GC End");
// Start a new incremental collection set for the next pause
assert(g1_policy()->collection_set() == NULL, "must be");
@@ -1639,7 +1640,7 @@
HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size, AllocationContext_t context) {
assert_at_safepoint(true /* should_be_vm_thread */);
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes);
log_debug(gc, ergo, heap)("Attempt heap expansion (allocation request failed). Allocation request: " SIZE_FORMAT "B",
@@ -1648,7 +1649,7 @@
if (expand(expand_bytes)) {
_hrm.verify_optional();
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
return attempt_allocation_at_safepoint(word_size,
context,
false /* expect_null_mutator_alloc_region */);
@@ -1717,7 +1718,7 @@
}
void G1CollectedHeap::shrink(size_t shrink_bytes) {
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
// We should only reach here at the end of a Full GC which means we
// should not not be holding to any GC alloc regions. The method
@@ -1732,7 +1733,7 @@
rebuild_region_sets(true /* free_list_only */);
_hrm.verify_optional();
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
}
// Public methods.
@@ -1778,6 +1779,7 @@
/* are_GC_task_threads */true,
/* are_ConcurrentGC_threads */false);
_workers->initialize_workers();
+ _verifier = new G1HeapVerifier(this);
_allocator = G1Allocator::create_allocator(this);
_humongous_object_threshold_in_words = humongous_threshold_for(HeapRegion::GrainWords);
@@ -2667,452 +2669,11 @@
}
void G1CollectedHeap::prepare_for_verify() {
- if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) {
- ensure_parsability(false);
- }
- g1_rem_set()->prepare_for_verify();
-}
-
-bool G1CollectedHeap::allocated_since_marking(oop obj, HeapRegion* hr,
- VerifyOption vo) {
- switch (vo) {
- case VerifyOption_G1UsePrevMarking:
- return hr->obj_allocated_since_prev_marking(obj);
- case VerifyOption_G1UseNextMarking:
- return hr->obj_allocated_since_next_marking(obj);
- case VerifyOption_G1UseMarkWord:
- return false;
- default:
- ShouldNotReachHere();
- }
- return false; // keep some compilers happy
-}
-
-HeapWord* G1CollectedHeap::top_at_mark_start(HeapRegion* hr, VerifyOption vo) {
- switch (vo) {
- case VerifyOption_G1UsePrevMarking: return hr->prev_top_at_mark_start();
- case VerifyOption_G1UseNextMarking: return hr->next_top_at_mark_start();
- case VerifyOption_G1UseMarkWord: return NULL;
- default: ShouldNotReachHere();
- }
- return NULL; // keep some compilers happy
-}
-
-bool G1CollectedHeap::is_marked(oop obj, VerifyOption vo) {
- switch (vo) {
- case VerifyOption_G1UsePrevMarking: return isMarkedPrev(obj);
- case VerifyOption_G1UseNextMarking: return isMarkedNext(obj);
- case VerifyOption_G1UseMarkWord: return obj->is_gc_marked();
- default: ShouldNotReachHere();
- }
- return false; // keep some compilers happy
-}
-
-const char* G1CollectedHeap::top_at_mark_start_str(VerifyOption vo) {
- switch (vo) {
- case VerifyOption_G1UsePrevMarking: return "PTAMS";
- case VerifyOption_G1UseNextMarking: return "NTAMS";
- case VerifyOption_G1UseMarkWord: return "NONE";
- default: ShouldNotReachHere();
- }
- return NULL; // keep some compilers happy
+ _verifier->prepare_for_verify();
}
-class VerifyRootsClosure: public OopClosure {
-private:
- G1CollectedHeap* _g1h;
- VerifyOption _vo;
- bool _failures;
-public:
- // _vo == UsePrevMarking -> use "prev" marking information,
- // _vo == UseNextMarking -> use "next" marking information,
- // _vo == UseMarkWord -> use mark word from object header.
- VerifyRootsClosure(VerifyOption vo) :
- _g1h(G1CollectedHeap::heap()),
- _vo(vo),
- _failures(false) { }
-
- bool failures() { return _failures; }
-
- template <class T> void do_oop_nv(T* p) {
- T heap_oop = oopDesc::load_heap_oop(p);
- if (!oopDesc::is_null(heap_oop)) {
- oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
- if (_g1h->is_obj_dead_cond(obj, _vo)) {
- LogHandle(gc, verify) log;
- log.info("Root location " PTR_FORMAT " points to dead obj " PTR_FORMAT, p2i(p), p2i(obj));
- if (_vo == VerifyOption_G1UseMarkWord) {
- log.info(" Mark word: " PTR_FORMAT, p2i(obj->mark()));
- }
- ResourceMark rm;
- obj->print_on(log.info_stream());
- _failures = true;
- }
- }
- }
-
- void do_oop(oop* p) { do_oop_nv(p); }
- void do_oop(narrowOop* p) { do_oop_nv(p); }
-};
-
-class G1VerifyCodeRootOopClosure: public OopClosure {
- G1CollectedHeap* _g1h;
- OopClosure* _root_cl;
- nmethod* _nm;
- VerifyOption _vo;
- bool _failures;
-
- template <class T> void do_oop_work(T* p) {
- // First verify that this root is live
- _root_cl->do_oop(p);
-
- if (!G1VerifyHeapRegionCodeRoots) {
- // We're not verifying the code roots attached to heap region.
- return;
- }
-
- // Don't check the code roots during marking verification in a full GC
- if (_vo == VerifyOption_G1UseMarkWord) {
- return;
- }
-
- // Now verify that the current nmethod (which contains p) is
- // in the code root list of the heap region containing the
- // object referenced by p.
-
- T heap_oop = oopDesc::load_heap_oop(p);
- if (!oopDesc::is_null(heap_oop)) {
- oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
-
- // Now fetch the region containing the object
- HeapRegion* hr = _g1h->heap_region_containing(obj);
- HeapRegionRemSet* hrrs = hr->rem_set();
- // Verify that the strong code root list for this region
- // contains the nmethod
- if (!hrrs->strong_code_roots_list_contains(_nm)) {
- log_info(gc, verify)("Code root location " PTR_FORMAT " "
- "from nmethod " PTR_FORMAT " not in strong "
- "code roots for region [" PTR_FORMAT "," PTR_FORMAT ")",
- p2i(p), p2i(_nm), p2i(hr->bottom()), p2i(hr->end()));
- _failures = true;
- }
- }
- }
-
-public:
- G1VerifyCodeRootOopClosure(G1CollectedHeap* g1h, OopClosure* root_cl, VerifyOption vo):
- _g1h(g1h), _root_cl(root_cl), _vo(vo), _nm(NULL), _failures(false) {}
-
- void do_oop(oop* p) { do_oop_work(p); }
- void do_oop(narrowOop* p) { do_oop_work(p); }
-
- void set_nmethod(nmethod* nm) { _nm = nm; }
- bool failures() { return _failures; }
-};
-
-class G1VerifyCodeRootBlobClosure: public CodeBlobClosure {
- G1VerifyCodeRootOopClosure* _oop_cl;
-
-public:
- G1VerifyCodeRootBlobClosure(G1VerifyCodeRootOopClosure* oop_cl):
- _oop_cl(oop_cl) {}
-
- void do_code_blob(CodeBlob* cb) {
- nmethod* nm = cb->as_nmethod_or_null();
- if (nm != NULL) {
- _oop_cl->set_nmethod(nm);
- nm->oops_do(_oop_cl);
- }
- }
-};
-
-class YoungRefCounterClosure : public OopClosure {
- G1CollectedHeap* _g1h;
- int _count;
- public:
- YoungRefCounterClosure(G1CollectedHeap* g1h) : _g1h(g1h), _count(0) {}
- void do_oop(oop* p) { if (_g1h->is_in_young(*p)) { _count++; } }
- void do_oop(narrowOop* p) { ShouldNotReachHere(); }
-
- int count() { return _count; }
- void reset_count() { _count = 0; };
-};
-
-class VerifyKlassClosure: public KlassClosure {
- YoungRefCounterClosure _young_ref_counter_closure;
- OopClosure *_oop_closure;
- public:
- VerifyKlassClosure(G1CollectedHeap* g1h, OopClosure* cl) : _young_ref_counter_closure(g1h), _oop_closure(cl) {}
- void do_klass(Klass* k) {
- k->oops_do(_oop_closure);
-
- _young_ref_counter_closure.reset_count();
- k->oops_do(&_young_ref_counter_closure);
- if (_young_ref_counter_closure.count() > 0) {
- guarantee(k->has_modified_oops(), "Klass " PTR_FORMAT ", has young refs but is not dirty.", p2i(k));
- }
- }
-};
-
-class VerifyLivenessOopClosure: public OopClosure {
- G1CollectedHeap* _g1h;
- VerifyOption _vo;
-public:
- VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo):
- _g1h(g1h), _vo(vo)
- { }
- void do_oop(narrowOop *p) { do_oop_work(p); }
- void do_oop( oop *p) { do_oop_work(p); }
-
- template <class T> void do_oop_work(T *p) {
- oop obj = oopDesc::load_decode_heap_oop(p);
- guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo),
- "Dead object referenced by a not dead object");
- }
-};
-
-class VerifyObjsInRegionClosure: public ObjectClosure {
-private:
- G1CollectedHeap* _g1h;
- size_t _live_bytes;
- HeapRegion *_hr;
- VerifyOption _vo;
-public:
- // _vo == UsePrevMarking -> use "prev" marking information,
- // _vo == UseNextMarking -> use "next" marking information,
- // _vo == UseMarkWord -> use mark word from object header.
- VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo)
- : _live_bytes(0), _hr(hr), _vo(vo) {
- _g1h = G1CollectedHeap::heap();
- }
- void do_object(oop o) {
- VerifyLivenessOopClosure isLive(_g1h, _vo);
- assert(o != NULL, "Huh?");
- if (!_g1h->is_obj_dead_cond(o, _vo)) {
- // If the object is alive according to the mark word,
- // then verify that the marking information agrees.
- // Note we can't verify the contra-positive of the
- // above: if the object is dead (according to the mark
- // word), it may not be marked, or may have been marked
- // but has since became dead, or may have been allocated
- // since the last marking.
- if (_vo == VerifyOption_G1UseMarkWord) {
- guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch");
- }
-
- o->oop_iterate_no_header(&isLive);
- if (!_hr->obj_allocated_since_prev_marking(o)) {
- size_t obj_size = o->size(); // Make sure we don't overflow
- _live_bytes += (obj_size * HeapWordSize);
- }
- }
- }
- size_t live_bytes() { return _live_bytes; }
-};
-
-class VerifyArchiveOopClosure: public OopClosure {
-public:
- VerifyArchiveOopClosure(HeapRegion *hr) { }
- void do_oop(narrowOop *p) { do_oop_work(p); }
- void do_oop( oop *p) { do_oop_work(p); }
-
- template <class T> void do_oop_work(T *p) {
- oop obj = oopDesc::load_decode_heap_oop(p);
- guarantee(obj == NULL || G1MarkSweep::in_archive_range(obj),
- "Archive object at " PTR_FORMAT " references a non-archive object at " PTR_FORMAT,
- p2i(p), p2i(obj));
- }
-};
-
-class VerifyArchiveRegionClosure: public ObjectClosure {
-public:
- VerifyArchiveRegionClosure(HeapRegion *hr) { }
- // Verify that all object pointers are to archive regions.
- void do_object(oop o) {
- VerifyArchiveOopClosure checkOop(NULL);
- assert(o != NULL, "Should not be here for NULL oops");
- o->oop_iterate_no_header(&checkOop);
- }
-};
-
-class VerifyRegionClosure: public HeapRegionClosure {
-private:
- bool _par;
- VerifyOption _vo;
- bool _failures;
-public:
- // _vo == UsePrevMarking -> use "prev" marking information,
- // _vo == UseNextMarking -> use "next" marking information,
- // _vo == UseMarkWord -> use mark word from object header.
- VerifyRegionClosure(bool par, VerifyOption vo)
- : _par(par),
- _vo(vo),
- _failures(false) {}
-
- bool failures() {
- return _failures;
- }
-
- bool doHeapRegion(HeapRegion* r) {
- // For archive regions, verify there are no heap pointers to
- // non-pinned regions. For all others, verify liveness info.
- if (r->is_archive()) {
- VerifyArchiveRegionClosure verify_oop_pointers(r);
- r->object_iterate(&verify_oop_pointers);
- return true;
- }
- if (!r->is_continues_humongous()) {
- bool failures = false;
- r->verify(_vo, &failures);
- if (failures) {
- _failures = true;
- } else if (!r->is_starts_humongous()) {
- VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo);
- r->object_iterate(¬_dead_yet_cl);
- if (_vo != VerifyOption_G1UseNextMarking) {
- if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) {
- log_info(gc, verify)("[" PTR_FORMAT "," PTR_FORMAT "] max_live_bytes " SIZE_FORMAT " < calculated " SIZE_FORMAT,
- p2i(r->bottom()), p2i(r->end()), r->max_live_bytes(), not_dead_yet_cl.live_bytes());
- _failures = true;
- }
- } else {
- // When vo == UseNextMarking we cannot currently do a sanity
- // check on the live bytes as the calculation has not been
- // finalized yet.
- }
- }
- }
- return false; // stop the region iteration if we hit a failure
- }
-};
-
-// This is the task used for parallel verification of the heap regions
-
-class G1ParVerifyTask: public AbstractGangTask {
-private:
- G1CollectedHeap* _g1h;
- VerifyOption _vo;
- bool _failures;
- HeapRegionClaimer _hrclaimer;
-
-public:
- // _vo == UsePrevMarking -> use "prev" marking information,
- // _vo == UseNextMarking -> use "next" marking information,
- // _vo == UseMarkWord -> use mark word from object header.
- G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) :
- AbstractGangTask("Parallel verify task"),
- _g1h(g1h),
- _vo(vo),
- _failures(false),
- _hrclaimer(g1h->workers()->active_workers()) {}
-
- bool failures() {
- return _failures;
- }
-
- void work(uint worker_id) {
- HandleMark hm;
- VerifyRegionClosure blk(true, _vo);
- _g1h->heap_region_par_iterate(&blk, worker_id, &_hrclaimer);
- if (blk.failures()) {
- _failures = true;
- }
- }
-};
-
void G1CollectedHeap::verify(VerifyOption vo) {
- if (!SafepointSynchronize::is_at_safepoint()) {
- log_info(gc, verify)("Skipping verification. Not at safepoint.");
- }
-
- assert(Thread::current()->is_VM_thread(),
- "Expected to be executed serially by the VM thread at this point");
-
- log_debug(gc, verify)("Roots");
- VerifyRootsClosure rootsCl(vo);
- VerifyKlassClosure klassCl(this, &rootsCl);
- CLDToKlassAndOopClosure cldCl(&klassCl, &rootsCl, false);
-
- // We apply the relevant closures to all the oops in the
- // system dictionary, class loader data graph, the string table
- // and the nmethods in the code cache.
- G1VerifyCodeRootOopClosure codeRootsCl(this, &rootsCl, vo);
- G1VerifyCodeRootBlobClosure blobsCl(&codeRootsCl);
-
- {
- G1RootProcessor root_processor(this, 1);
- root_processor.process_all_roots(&rootsCl,
- &cldCl,
- &blobsCl);
- }
-
- bool failures = rootsCl.failures() || codeRootsCl.failures();
-
- if (vo != VerifyOption_G1UseMarkWord) {
- // If we're verifying during a full GC then the region sets
- // will have been torn down at the start of the GC. Therefore
- // verifying the region sets will fail. So we only verify
- // the region sets when not in a full GC.
- log_debug(gc, verify)("HeapRegionSets");
- verify_region_sets();
- }
-
- log_debug(gc, verify)("HeapRegions");
- if (GCParallelVerificationEnabled && ParallelGCThreads > 1) {
-
- G1ParVerifyTask task(this, vo);
- workers()->run_task(&task);
- if (task.failures()) {
- failures = true;
- }
-
- } else {
- VerifyRegionClosure blk(false, vo);
- heap_region_iterate(&blk);
- if (blk.failures()) {
- failures = true;
- }
- }
-
- if (G1StringDedup::is_enabled()) {
- log_debug(gc, verify)("StrDedup");
- G1StringDedup::verify();
- }
-
- if (failures) {
- log_info(gc, verify)("Heap after failed verification:");
- // It helps to have the per-region information in the output to
- // help us track down what went wrong. This is why we call
- // print_extended_on() instead of print_on().
- LogHandle(gc, verify) log;
- ResourceMark rm;
- print_extended_on(log.info_stream());
- }
- guarantee(!failures, "there should not have been any failures");
-}
-
-double G1CollectedHeap::verify(bool guard, const char* msg) {
- double verify_time_ms = 0.0;
-
- if (guard && total_collections() >= VerifyGCStartAt) {
- double verify_start = os::elapsedTime();
- HandleMark hm; // Discard invalid handles created during verification
- prepare_for_verify();
- Universe::verify(VerifyOption_G1UsePrevMarking, msg);
- verify_time_ms = (os::elapsedTime() - verify_start) * 1000;
- }
-
- return verify_time_ms;
-}
-
-void G1CollectedHeap::verify_before_gc() {
- double verify_time_ms = verify(VerifyBeforeGC, "Before GC");
- g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms);
-}
-
-void G1CollectedHeap::verify_after_gc() {
- double verify_time_ms = verify(VerifyAfterGC, "After GC");
- g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms);
+ _verifier->verify(vo);
}
class PrintRegionClosure: public HeapRegionClosure {
@@ -3657,8 +3218,8 @@
print_heap_before_gc();
trace_heap_before_gc(_gc_tracer_stw);
- verify_region_sets_optional();
- verify_dirty_young_regions();
+ _verifier->verify_region_sets_optional();
+ _verifier->verify_dirty_young_regions();
// This call will decide whether this pause is an initial-mark
// pause. If it is, during_initial_mark_pause() will return true
@@ -3741,9 +3302,9 @@
heap_region_iterate(&v_cl);
}
- verify_before_gc();
-
- check_bitmaps("GC Start");
+ _verifier->verify_before_gc();
+
+ _verifier->check_bitmaps("GC Start");
#if defined(COMPILER2) || INCLUDE_JVMCI
DerivedPointerTable::clear();
@@ -3801,7 +3362,7 @@
register_humongous_regions_with_cset();
- assert(check_cset_fast_test(), "Inconsistency in the InCSetState table.");
+ assert(_verifier->check_cset_fast_test(), "Inconsistency in the InCSetState table.");
_cm->note_start_of_gc();
// We call this after finalize_cset() to
@@ -3951,8 +3512,8 @@
heap_region_iterate(&v_cl);
}
- verify_after_gc();
- check_bitmaps("GC End");
+ _verifier->verify_after_gc();
+ _verifier->check_bitmaps("GC End");
assert(!ref_processor_stw()->discovery_enabled(), "Postcondition");
ref_processor_stw()->verify_no_references_recorded();
@@ -3976,7 +3537,7 @@
// logging output either.
_hrm.verify_optional();
- verify_region_sets_optional();
+ _verifier->verify_region_sets_optional();
TASKQUEUE_STATS_ONLY(print_taskqueue_stats());
TASKQUEUE_STATS_ONLY(reset_taskqueue_stats());
@@ -5245,197 +4806,6 @@
}
};
-#ifndef PRODUCT
-class G1VerifyCardTableCleanup: public HeapRegionClosure {
- G1CollectedHeap* _g1h;
- G1SATBCardTableModRefBS* _ct_bs;
-public:
- G1VerifyCardTableCleanup(G1CollectedHeap* g1h, G1SATBCardTableModRefBS* ct_bs)
- : _g1h(g1h), _ct_bs(ct_bs) { }
- virtual bool doHeapRegion(HeapRegion* r) {
- if (r->is_survivor()) {
- _g1h->verify_dirty_region(r);
- } else {
- _g1h->verify_not_dirty_region(r);
- }
- return false;
- }
-};
-
-void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) {
- // All of the region should be clean.
- G1SATBCardTableModRefBS* ct_bs = g1_barrier_set();
- MemRegion mr(hr->bottom(), hr->end());
- ct_bs->verify_not_dirty_region(mr);
-}
-
-void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) {
- // We cannot guarantee that [bottom(),end()] is dirty. Threads
- // dirty allocated blocks as they allocate them. The thread that
- // retires each region and replaces it with a new one will do a
- // maximal allocation to fill in [pre_dummy_top(),end()] but will
- // not dirty that area (one less thing to have to do while holding
- // a lock). So we can only verify that [bottom(),pre_dummy_top()]
- // is dirty.
- G1SATBCardTableModRefBS* ct_bs = g1_barrier_set();
- MemRegion mr(hr->bottom(), hr->pre_dummy_top());
- if (hr->is_young()) {
- ct_bs->verify_g1_young_region(mr);
- } else {
- ct_bs->verify_dirty_region(mr);
- }
-}
-
-void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) {
- G1SATBCardTableModRefBS* ct_bs = g1_barrier_set();
- for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) {
- verify_dirty_region(hr);
- }
-}
-
-void G1CollectedHeap::verify_dirty_young_regions() {
- verify_dirty_young_list(_young_list->first_region());
-}
-
-bool G1CollectedHeap::verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap,
- HeapWord* tams, HeapWord* end) {
- guarantee(tams <= end,
- "tams: " PTR_FORMAT " end: " PTR_FORMAT, p2i(tams), p2i(end));
- HeapWord* result = bitmap->getNextMarkedWordAddress(tams, end);
- if (result < end) {
- log_info(gc, verify)("## wrong marked address on %s bitmap: " PTR_FORMAT, bitmap_name, p2i(result));
- log_info(gc, verify)("## %s tams: " PTR_FORMAT " end: " PTR_FORMAT, bitmap_name, p2i(tams), p2i(end));
- return false;
- }
- return true;
-}
-
-bool G1CollectedHeap::verify_bitmaps(const char* caller, HeapRegion* hr) {
- CMBitMapRO* prev_bitmap = concurrent_mark()->prevMarkBitMap();
- CMBitMapRO* next_bitmap = (CMBitMapRO*) concurrent_mark()->nextMarkBitMap();
-
- HeapWord* bottom = hr->bottom();
- HeapWord* ptams = hr->prev_top_at_mark_start();
- HeapWord* ntams = hr->next_top_at_mark_start();
- HeapWord* end = hr->end();
-
- bool res_p = verify_no_bits_over_tams("prev", prev_bitmap, ptams, end);
-
- bool res_n = true;
- // We reset mark_in_progress() before we reset _cmThread->in_progress() and in this window
- // we do the clearing of the next bitmap concurrently. Thus, we can not verify the bitmap
- // if we happen to be in that state.
- if (collector_state()->mark_in_progress() || !_cmThread->in_progress()) {
- res_n = verify_no_bits_over_tams("next", next_bitmap, ntams, end);
- }
- if (!res_p || !res_n) {
- log_info(gc, verify)("#### Bitmap verification failed for " HR_FORMAT, HR_FORMAT_PARAMS(hr));
- log_info(gc, verify)("#### Caller: %s", caller);
- return false;
- }
- return true;
-}
-
-void G1CollectedHeap::check_bitmaps(const char* caller, HeapRegion* hr) {
- if (!G1VerifyBitmaps) return;
-
- guarantee(verify_bitmaps(caller, hr), "bitmap verification");
-}
-
-class G1VerifyBitmapClosure : public HeapRegionClosure {
-private:
- const char* _caller;
- G1CollectedHeap* _g1h;
- bool _failures;
-
-public:
- G1VerifyBitmapClosure(const char* caller, G1CollectedHeap* g1h) :
- _caller(caller), _g1h(g1h), _failures(false) { }
-
- bool failures() { return _failures; }
-
- virtual bool doHeapRegion(HeapRegion* hr) {
- bool result = _g1h->verify_bitmaps(_caller, hr);
- if (!result) {
- _failures = true;
- }
- return false;
- }
-};
-
-void G1CollectedHeap::check_bitmaps(const char* caller) {
- if (!G1VerifyBitmaps) return;
-
- G1VerifyBitmapClosure cl(caller, this);
- heap_region_iterate(&cl);
- guarantee(!cl.failures(), "bitmap verification");
-}
-
-class G1CheckCSetFastTableClosure : public HeapRegionClosure {
- private:
- bool _failures;
- public:
- G1CheckCSetFastTableClosure() : HeapRegionClosure(), _failures(false) { }
-
- virtual bool doHeapRegion(HeapRegion* hr) {
- uint i = hr->hrm_index();
- InCSetState cset_state = (InCSetState) G1CollectedHeap::heap()->_in_cset_fast_test.get_by_index(i);
- if (hr->is_humongous()) {
- if (hr->in_collection_set()) {
- log_info(gc, verify)("## humongous region %u in CSet", i);
- _failures = true;
- return true;
- }
- if (cset_state.is_in_cset()) {
- log_info(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for humongous region %u", cset_state.value(), i);
- _failures = true;
- return true;
- }
- if (hr->is_continues_humongous() && cset_state.is_humongous()) {
- log_info(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for continues humongous region %u", cset_state.value(), i);
- _failures = true;
- return true;
- }
- } else {
- if (cset_state.is_humongous()) {
- log_info(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for non-humongous region %u", cset_state.value(), i);
- _failures = true;
- return true;
- }
- if (hr->in_collection_set() != cset_state.is_in_cset()) {
- log_info(gc, verify)("## in CSet %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
- hr->in_collection_set(), cset_state.value(), i);
- _failures = true;
- return true;
- }
- if (cset_state.is_in_cset()) {
- if (hr->is_young() != (cset_state.is_young())) {
- log_info(gc, verify)("## is_young %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
- hr->is_young(), cset_state.value(), i);
- _failures = true;
- return true;
- }
- if (hr->is_old() != (cset_state.is_old())) {
- log_info(gc, verify)("## is_old %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
- hr->is_old(), cset_state.value(), i);
- _failures = true;
- return true;
- }
- }
- }
- return false;
- }
-
- bool failures() const { return _failures; }
-};
-
-bool G1CollectedHeap::check_cset_fast_test() {
- G1CheckCSetFastTableClosure cl;
- _hrm.iterate(&cl);
- return !cl.failures();
-}
-#endif // PRODUCT
-
class G1ParScrubRemSetTask: public AbstractGangTask {
protected:
G1RemSet* _g1rs;
@@ -5473,10 +4843,7 @@
workers()->run_task(&cleanup_task);
#ifndef PRODUCT
- if (G1VerifyCTCleanup || VerifyAfterGC) {
- G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs);
- heap_region_iterate(&cleanup_verifier);
- }
+ _verifier->verify_card_table_cleanup();
#endif
}
@@ -5998,7 +5365,7 @@
if (new_alloc_region != NULL) {
set_region_short_lived_locked(new_alloc_region);
_hr_printer.alloc(new_alloc_region, young_list_full);
- check_bitmaps("Mutator Region Allocation", new_alloc_region);
+ _verifier->check_bitmaps("Mutator Region Allocation", new_alloc_region);
return new_alloc_region;
}
}
@@ -6038,10 +5405,10 @@
new_alloc_region->record_timestamp();
if (is_survivor) {
new_alloc_region->set_survivor();
- check_bitmaps("Survivor Region Allocation", new_alloc_region);
+ _verifier->check_bitmaps("Survivor Region Allocation", new_alloc_region);
} else {
new_alloc_region->set_old();
- check_bitmaps("Old Region Allocation", new_alloc_region);
+ _verifier->check_bitmaps("Old Region Allocation", new_alloc_region);
}
_hr_printer.alloc(new_alloc_region);
bool during_im = collector_state()->during_initial_mark_pause();
@@ -6081,93 +5448,6 @@
return NULL;
}
-// Heap region set verification
-
-class VerifyRegionListsClosure : public HeapRegionClosure {
-private:
- HeapRegionSet* _old_set;
- HeapRegionSet* _humongous_set;
- HeapRegionManager* _hrm;
-
-public:
- uint _old_count;
- uint _humongous_count;
- uint _free_count;
-
- VerifyRegionListsClosure(HeapRegionSet* old_set,
- HeapRegionSet* humongous_set,
- HeapRegionManager* hrm) :
- _old_set(old_set), _humongous_set(humongous_set), _hrm(hrm),
- _old_count(), _humongous_count(), _free_count(){ }
-
- bool doHeapRegion(HeapRegion* hr) {
- if (hr->is_young()) {
- // TODO
- } else if (hr->is_humongous()) {
- assert(hr->containing_set() == _humongous_set, "Heap region %u is humongous but not in humongous set.", hr->hrm_index());
- _humongous_count++;
- } else if (hr->is_empty()) {
- assert(_hrm->is_free(hr), "Heap region %u is empty but not on the free list.", hr->hrm_index());
- _free_count++;
- } else if (hr->is_old()) {
- assert(hr->containing_set() == _old_set, "Heap region %u is old but not in the old set.", hr->hrm_index());
- _old_count++;
- } else {
- // There are no other valid region types. Check for one invalid
- // one we can identify: pinned without old or humongous set.
- assert(!hr->is_pinned(), "Heap region %u is pinned but not old (archive) or humongous.", hr->hrm_index());
- ShouldNotReachHere();
- }
- return false;
- }
-
- void verify_counts(HeapRegionSet* old_set, HeapRegionSet* humongous_set, HeapRegionManager* free_list) {
- guarantee(old_set->length() == _old_count, "Old set count mismatch. Expected %u, actual %u.", old_set->length(), _old_count);
- guarantee(humongous_set->length() == _humongous_count, "Hum set count mismatch. Expected %u, actual %u.", humongous_set->length(), _humongous_count);
- guarantee(free_list->num_free_regions() == _free_count, "Free list count mismatch. Expected %u, actual %u.", free_list->num_free_regions(), _free_count);
- }
-};
-
-void G1CollectedHeap::verify_region_sets() {
- assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */);
-
- // First, check the explicit lists.
- _hrm.verify();
- {
- // Given that a concurrent operation might be adding regions to
- // the secondary free list we have to take the lock before
- // verifying it.
- MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag);
- _secondary_free_list.verify_list();
- }
-
- // If a concurrent region freeing operation is in progress it will
- // be difficult to correctly attributed any free regions we come
- // across to the correct free list given that they might belong to
- // one of several (free_list, secondary_free_list, any local lists,
- // etc.). So, if that's the case we will skip the rest of the
- // verification operation. Alternatively, waiting for the concurrent
- // operation to complete will have a non-trivial effect on the GC's
- // operation (no concurrent operation will last longer than the
- // interval between two calls to verification) and it might hide
- // any issues that we would like to catch during testing.
- if (free_regions_coming()) {
- return;
- }
-
- // Make sure we append the secondary_free_list on the free_list so
- // that all free regions we will come across can be safely
- // attributed to the free_list.
- append_secondary_free_list_if_not_empty_with_lock();
-
- // Finally, make sure that the region accounting in the lists is
- // consistent with what we see in the heap.
-
- VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_hrm);
- heap_region_iterate(&cl);
- cl.verify_counts(&_old_set, &_humongous_set, &_hrm);
-}
-
// Optimized nmethod scanning
class RegisterNMethodOopClosure: public OopClosure {
--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.hpp Wed Jan 27 05:59:31 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.hpp Tue Jan 26 15:28:31 2016 +0100
@@ -82,6 +82,7 @@
class WorkGang;
class G1Allocator;
class G1ArchiveAllocator;
+class G1HeapVerifier;
typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue;
typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet;
@@ -118,6 +119,7 @@
friend class VMStructs;
friend class MutatorAllocRegion;
friend class G1GCAllocRegion;
+ friend class G1HeapVerifier;
// Closures used in implementation.
friend class G1ParScanThreadState;
@@ -181,6 +183,9 @@
// Manages all allocations with regions except humongous object allocations.
G1Allocator* _allocator;
+ // Manages all heap verification.
+ G1HeapVerifier* _verifier;
+
// Outside of GC pauses, the number of bytes used in all regions other
// than the current allocation region(s).
size_t _summary_bytes_used;
@@ -286,10 +291,6 @@
size_t size,
size_t translation_factor);
- double verify(bool guard, const char* msg);
- void verify_before_gc();
- void verify_after_gc();
-
void log_gc_footer(jlong pause_time_counter);
void trace_heap(GCWhen::Type when, const GCTracer* tracer);
@@ -527,6 +528,10 @@
return _allocator;
}
+ G1HeapVerifier* verifier() {
+ return _verifier;
+ }
+
G1MonitoringSupport* g1mm() {
assert(_g1mm != NULL, "should have been initialized");
return _g1mm;
@@ -1056,54 +1061,6 @@
// The number of regions that are not completely free.
uint num_used_regions() const { return num_regions() - num_free_regions(); }
- void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN;
- void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN;
- void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN;
- void verify_dirty_young_regions() PRODUCT_RETURN;
-
-#ifndef PRODUCT
- // Make sure that the given bitmap has no marked objects in the
- // range [from,limit). If it does, print an error message and return
- // false. Otherwise, just return true. bitmap_name should be "prev"
- // or "next".
- bool verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap,
- HeapWord* from, HeapWord* limit);
-
- // Verify that the prev / next bitmap range [tams,end) for the given
- // region has no marks. Return true if all is well, false if errors
- // are detected.
- bool verify_bitmaps(const char* caller, HeapRegion* hr);
-#endif // PRODUCT
-
- // If G1VerifyBitmaps is set, verify that the marking bitmaps for
- // the given region do not have any spurious marks. If errors are
- // detected, print appropriate error messages and crash.
- void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN;
-
- // If G1VerifyBitmaps is set, verify that the marking bitmaps do not
- // have any spurious marks. If errors are detected, print
- // appropriate error messages and crash.
- void check_bitmaps(const char* caller) PRODUCT_RETURN;
-
- // Do sanity check on the contents of the in-cset fast test table.
- bool check_cset_fast_test() PRODUCT_RETURN_( return true; );
-
- // verify_region_sets() performs verification over the region
- // lists. It will be compiled in the product code to be used when
- // necessary (i.e., during heap verification).
- void verify_region_sets();
-
- // verify_region_sets_optional() is planted in the code for
- // list verification in non-product builds (and it can be enabled in
- // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1).
-#if HEAP_REGION_SET_FORCE_VERIFY
- void verify_region_sets_optional() {
- verify_region_sets();
- }
-#else // HEAP_REGION_SET_FORCE_VERIFY
- void verify_region_sets_optional() { }
-#endif // HEAP_REGION_SET_FORCE_VERIFY
-
#ifdef ASSERT
bool is_on_master_free_list(HeapRegion* hr) {
return _hrm.is_free(hr);
@@ -1425,11 +1382,6 @@
inline bool is_obj_ill(const oop obj) const;
- bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo);
- HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo);
- bool is_marked(oop obj, VerifyOption vo);
- const char* top_at_mark_start_str(VerifyOption vo);
-
ConcurrentMark* concurrent_mark() const { return _cm; }
// Refinement
--- a/hotspot/src/share/vm/gc/g1/g1EvacFailure.cpp Wed Jan 27 05:59:31 2016 +0100
+++ b/hotspot/src/share/vm/gc/g1/g1EvacFailure.cpp Tue Jan 26 15:28:31 2016 +0100
@@ -28,6 +28,7 @@
#include "gc/g1/g1CollectedHeap.inline.hpp"
#include "gc/g1/g1CollectorState.hpp"
#include "gc/g1/g1EvacFailure.hpp"
+#include "gc/g1/g1HeapVerifier.hpp"
#include "gc/g1/g1OopClosures.inline.hpp"
#include "gc/g1/g1_globals.hpp"
#include "gc/g1/heapRegion.hpp"
@@ -223,7 +224,7 @@
if (hr->evacuation_failed()) {
hr->note_self_forwarding_removal_start(during_initial_mark,
during_conc_mark);
- _g1h->check_bitmaps("Self-Forwarding Ptr Removal", hr);
+ _g1h->verifier()->check_bitmaps("Self-Forwarding Ptr Removal", hr);
// In the common case (i.e. when there is no evacuation
// failure) we make sure that the following is done when
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1HeapVerifier.cpp Tue Jan 26 15:28:31 2016 +0100
@@ -0,0 +1,731 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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 "logging/log.hpp"
+#include "gc/g1/concurrentMarkThread.hpp"
+#include "gc/g1/g1CollectedHeap.hpp"
+#include "gc/g1/g1CollectedHeap.inline.hpp"
+#include "gc/g1/g1HeapVerifier.hpp"
+#include "gc/g1/g1MarkSweep.hpp"
+#include "gc/g1/g1RemSet.hpp"
+#include "gc/g1/g1RootProcessor.hpp"
+#include "gc/g1/heapRegion.hpp"
+#include "gc/g1/heapRegion.inline.hpp"
+#include "gc/g1/heapRegionRemSet.hpp"
+#include "gc/g1/g1StringDedup.hpp"
+#include "gc/g1/youngList.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/oop.inline.hpp"
+
+class VerifyRootsClosure: public OopClosure {
+private:
+ G1CollectedHeap* _g1h;
+ VerifyOption _vo;
+ bool _failures;
+public:
+ // _vo == UsePrevMarking -> use "prev" marking information,
+ // _vo == UseNextMarking -> use "next" marking information,
+ // _vo == UseMarkWord -> use mark word from object header.
+ VerifyRootsClosure(VerifyOption vo) :
+ _g1h(G1CollectedHeap::heap()),
+ _vo(vo),
+ _failures(false) { }
+
+ bool failures() { return _failures; }
+
+ template <class T> void do_oop_nv(T* p) {
+ T heap_oop = oopDesc::load_heap_oop(p);
+ if (!oopDesc::is_null(heap_oop)) {
+ oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
+ if (_g1h->is_obj_dead_cond(obj, _vo)) {
+ LogHandle(gc, verify) log;
+ log.info("Root location " PTR_FORMAT " points to dead obj " PTR_FORMAT, p2i(p), p2i(obj));
+ if (_vo == VerifyOption_G1UseMarkWord) {
+ log.info(" Mark word: " PTR_FORMAT, p2i(obj->mark()));
+ }
+ ResourceMark rm;
+ obj->print_on(log.info_stream());
+ _failures = true;
+ }
+ }
+ }
+
+ void do_oop(oop* p) { do_oop_nv(p); }
+ void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+class G1VerifyCodeRootOopClosure: public OopClosure {
+ G1CollectedHeap* _g1h;
+ OopClosure* _root_cl;
+ nmethod* _nm;
+ VerifyOption _vo;
+ bool _failures;
+
+ template <class T> void do_oop_work(T* p) {
+ // First verify that this root is live
+ _root_cl->do_oop(p);
+
+ if (!G1VerifyHeapRegionCodeRoots) {
+ // We're not verifying the code roots attached to heap region.
+ return;
+ }
+
+ // Don't check the code roots during marking verification in a full GC
+ if (_vo == VerifyOption_G1UseMarkWord) {
+ return;
+ }
+
+ // Now verify that the current nmethod (which contains p) is
+ // in the code root list of the heap region containing the
+ // object referenced by p.
+
+ T heap_oop = oopDesc::load_heap_oop(p);
+ if (!oopDesc::is_null(heap_oop)) {
+ oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
+
+ // Now fetch the region containing the object
+ HeapRegion* hr = _g1h->heap_region_containing(obj);
+ HeapRegionRemSet* hrrs = hr->rem_set();
+ // Verify that the strong code root list for this region
+ // contains the nmethod
+ if (!hrrs->strong_code_roots_list_contains(_nm)) {
+ log_info(gc, verify)("Code root location " PTR_FORMAT " "
+ "from nmethod " PTR_FORMAT " not in strong "
+ "code roots for region [" PTR_FORMAT "," PTR_FORMAT ")",
+ p2i(p), p2i(_nm), p2i(hr->bottom()), p2i(hr->end()));
+ _failures = true;
+ }
+ }
+ }
+
+public:
+ G1VerifyCodeRootOopClosure(G1CollectedHeap* g1h, OopClosure* root_cl, VerifyOption vo):
+ _g1h(g1h), _root_cl(root_cl), _vo(vo), _nm(NULL), _failures(false) {}
+
+ void do_oop(oop* p) { do_oop_work(p); }
+ void do_oop(narrowOop* p) { do_oop_work(p); }
+
+ void set_nmethod(nmethod* nm) { _nm = nm; }
+ bool failures() { return _failures; }
+};
+
+class G1VerifyCodeRootBlobClosure: public CodeBlobClosure {
+ G1VerifyCodeRootOopClosure* _oop_cl;
+
+public:
+ G1VerifyCodeRootBlobClosure(G1VerifyCodeRootOopClosure* oop_cl):
+ _oop_cl(oop_cl) {}
+
+ void do_code_blob(CodeBlob* cb) {
+ nmethod* nm = cb->as_nmethod_or_null();
+ if (nm != NULL) {
+ _oop_cl->set_nmethod(nm);
+ nm->oops_do(_oop_cl);
+ }
+ }
+};
+
+class YoungRefCounterClosure : public OopClosure {
+ G1CollectedHeap* _g1h;
+ int _count;
+ public:
+ YoungRefCounterClosure(G1CollectedHeap* g1h) : _g1h(g1h), _count(0) {}
+ void do_oop(oop* p) { if (_g1h->is_in_young(*p)) { _count++; } }
+ void do_oop(narrowOop* p) { ShouldNotReachHere(); }
+
+ int count() { return _count; }
+ void reset_count() { _count = 0; };
+};
+
+class VerifyKlassClosure: public KlassClosure {
+ YoungRefCounterClosure _young_ref_counter_closure;
+ OopClosure *_oop_closure;
+ public:
+ VerifyKlassClosure(G1CollectedHeap* g1h, OopClosure* cl) : _young_ref_counter_closure(g1h), _oop_closure(cl) {}
+ void do_klass(Klass* k) {
+ k->oops_do(_oop_closure);
+
+ _young_ref_counter_closure.reset_count();
+ k->oops_do(&_young_ref_counter_closure);
+ if (_young_ref_counter_closure.count() > 0) {
+ guarantee(k->has_modified_oops(), "Klass " PTR_FORMAT ", has young refs but is not dirty.", p2i(k));
+ }
+ }
+};
+
+class VerifyLivenessOopClosure: public OopClosure {
+ G1CollectedHeap* _g1h;
+ VerifyOption _vo;
+public:
+ VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo):
+ _g1h(g1h), _vo(vo)
+ { }
+ void do_oop(narrowOop *p) { do_oop_work(p); }
+ void do_oop( oop *p) { do_oop_work(p); }
+
+ template <class T> void do_oop_work(T *p) {
+ oop obj = oopDesc::load_decode_heap_oop(p);
+ guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo),
+ "Dead object referenced by a not dead object");
+ }
+};
+
+class VerifyObjsInRegionClosure: public ObjectClosure {
+private:
+ G1CollectedHeap* _g1h;
+ size_t _live_bytes;
+ HeapRegion *_hr;
+ VerifyOption _vo;
+public:
+ // _vo == UsePrevMarking -> use "prev" marking information,
+ // _vo == UseNextMarking -> use "next" marking information,
+ // _vo == UseMarkWord -> use mark word from object header.
+ VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo)
+ : _live_bytes(0), _hr(hr), _vo(vo) {
+ _g1h = G1CollectedHeap::heap();
+ }
+ void do_object(oop o) {
+ VerifyLivenessOopClosure isLive(_g1h, _vo);
+ assert(o != NULL, "Huh?");
+ if (!_g1h->is_obj_dead_cond(o, _vo)) {
+ // If the object is alive according to the mark word,
+ // then verify that the marking information agrees.
+ // Note we can't verify the contra-positive of the
+ // above: if the object is dead (according to the mark
+ // word), it may not be marked, or may have been marked
+ // but has since became dead, or may have been allocated
+ // since the last marking.
+ if (_vo == VerifyOption_G1UseMarkWord) {
+ guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch");
+ }
+
+ o->oop_iterate_no_header(&isLive);
+ if (!_hr->obj_allocated_since_prev_marking(o)) {
+ size_t obj_size = o->size(); // Make sure we don't overflow
+ _live_bytes += (obj_size * HeapWordSize);
+ }
+ }
+ }
+ size_t live_bytes() { return _live_bytes; }
+};
+
+class VerifyArchiveOopClosure: public OopClosure {
+public:
+ VerifyArchiveOopClosure(HeapRegion *hr) { }
+ void do_oop(narrowOop *p) { do_oop_work(p); }
+ void do_oop( oop *p) { do_oop_work(p); }
+
+ template <class T> void do_oop_work(T *p) {
+ oop obj = oopDesc::load_decode_heap_oop(p);
+ guarantee(obj == NULL || G1MarkSweep::in_archive_range(obj),
+ "Archive object at " PTR_FORMAT " references a non-archive object at " PTR_FORMAT,
+ p2i(p), p2i(obj));
+ }
+};
+
+class VerifyArchiveRegionClosure: public ObjectClosure {
+public:
+ VerifyArchiveRegionClosure(HeapRegion *hr) { }
+ // Verify that all object pointers are to archive regions.
+ void do_object(oop o) {
+ VerifyArchiveOopClosure checkOop(NULL);
+ assert(o != NULL, "Should not be here for NULL oops");
+ o->oop_iterate_no_header(&checkOop);
+ }
+};
+
+class VerifyRegionClosure: public HeapRegionClosure {
+private:
+ bool _par;
+ VerifyOption _vo;
+ bool _failures;
+public:
+ // _vo == UsePrevMarking -> use "prev" marking information,
+ // _vo == UseNextMarking -> use "next" marking information,
+ // _vo == UseMarkWord -> use mark word from object header.
+ VerifyRegionClosure(bool par, VerifyOption vo)
+ : _par(par),
+ _vo(vo),
+ _failures(false) {}
+
+ bool failures() {
+ return _failures;
+ }
+
+ bool doHeapRegion(HeapRegion* r) {
+ // For archive regions, verify there are no heap pointers to
+ // non-pinned regions. For all others, verify liveness info.
+ if (r->is_archive()) {
+ VerifyArchiveRegionClosure verify_oop_pointers(r);
+ r->object_iterate(&verify_oop_pointers);
+ return true;
+ }
+ if (!r->is_continues_humongous()) {
+ bool failures = false;
+ r->verify(_vo, &failures);
+ if (failures) {
+ _failures = true;
+ } else if (!r->is_starts_humongous()) {
+ VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo);
+ r->object_iterate(¬_dead_yet_cl);
+ if (_vo != VerifyOption_G1UseNextMarking) {
+ if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) {
+ log_info(gc, verify)("[" PTR_FORMAT "," PTR_FORMAT "] max_live_bytes " SIZE_FORMAT " < calculated " SIZE_FORMAT,
+ p2i(r->bottom()), p2i(r->end()), r->max_live_bytes(), not_dead_yet_cl.live_bytes());
+ _failures = true;
+ }
+ } else {
+ // When vo == UseNextMarking we cannot currently do a sanity
+ // check on the live bytes as the calculation has not been
+ // finalized yet.
+ }
+ }
+ }
+ return false; // stop the region iteration if we hit a failure
+ }
+};
+
+// This is the task used for parallel verification of the heap regions
+
+class G1ParVerifyTask: public AbstractGangTask {
+private:
+ G1CollectedHeap* _g1h;
+ VerifyOption _vo;
+ bool _failures;
+ HeapRegionClaimer _hrclaimer;
+
+public:
+ // _vo == UsePrevMarking -> use "prev" marking information,
+ // _vo == UseNextMarking -> use "next" marking information,
+ // _vo == UseMarkWord -> use mark word from object header.
+ G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) :
+ AbstractGangTask("Parallel verify task"),
+ _g1h(g1h),
+ _vo(vo),
+ _failures(false),
+ _hrclaimer(g1h->workers()->active_workers()) {}
+
+ bool failures() {
+ return _failures;
+ }
+
+ void work(uint worker_id) {
+ HandleMark hm;
+ VerifyRegionClosure blk(true, _vo);
+ _g1h->heap_region_par_iterate(&blk, worker_id, &_hrclaimer);
+ if (blk.failures()) {
+ _failures = true;
+ }
+ }
+};
+
+
+void G1HeapVerifier::verify(VerifyOption vo) {
+ if (!SafepointSynchronize::is_at_safepoint()) {
+ log_info(gc, verify)("Skipping verification. Not at safepoint.");
+ }
+
+ assert(Thread::current()->is_VM_thread(),
+ "Expected to be executed serially by the VM thread at this point");
+
+ log_debug(gc, verify)("Roots");
+ VerifyRootsClosure rootsCl(vo);
+ VerifyKlassClosure klassCl(_g1h, &rootsCl);
+ CLDToKlassAndOopClosure cldCl(&klassCl, &rootsCl, false);
+
+ // We apply the relevant closures to all the oops in the
+ // system dictionary, class loader data graph, the string table
+ // and the nmethods in the code cache.
+ G1VerifyCodeRootOopClosure codeRootsCl(_g1h, &rootsCl, vo);
+ G1VerifyCodeRootBlobClosure blobsCl(&codeRootsCl);
+
+ {
+ G1RootProcessor root_processor(_g1h, 1);
+ root_processor.process_all_roots(&rootsCl,
+ &cldCl,
+ &blobsCl);
+ }
+
+ bool failures = rootsCl.failures() || codeRootsCl.failures();
+
+ if (vo != VerifyOption_G1UseMarkWord) {
+ // If we're verifying during a full GC then the region sets
+ // will have been torn down at the start of the GC. Therefore
+ // verifying the region sets will fail. So we only verify
+ // the region sets when not in a full GC.
+ log_debug(gc, verify)("HeapRegionSets");
+ verify_region_sets();
+ }
+
+ log_debug(gc, verify)("HeapRegions");
+ if (GCParallelVerificationEnabled && ParallelGCThreads > 1) {
+
+ G1ParVerifyTask task(_g1h, vo);
+ _g1h->workers()->run_task(&task);
+ if (task.failures()) {
+ failures = true;
+ }
+
+ } else {
+ VerifyRegionClosure blk(false, vo);
+ _g1h->heap_region_iterate(&blk);
+ if (blk.failures()) {
+ failures = true;
+ }
+ }
+
+ if (G1StringDedup::is_enabled()) {
+ log_debug(gc, verify)("StrDedup");
+ G1StringDedup::verify();
+ }
+
+ if (failures) {
+ log_info(gc, verify)("Heap after failed verification:");
+ // It helps to have the per-region information in the output to
+ // help us track down what went wrong. This is why we call
+ // print_extended_on() instead of print_on().
+ LogHandle(gc, verify) log;
+ ResourceMark rm;
+ _g1h->print_extended_on(log.info_stream());
+ }
+ guarantee(!failures, "there should not have been any failures");
+}
+
+// Heap region set verification
+
+class VerifyRegionListsClosure : public HeapRegionClosure {
+private:
+ HeapRegionSet* _old_set;
+ HeapRegionSet* _humongous_set;
+ HeapRegionManager* _hrm;
+
+public:
+ uint _old_count;
+ uint _humongous_count;
+ uint _free_count;
+
+ VerifyRegionListsClosure(HeapRegionSet* old_set,
+ HeapRegionSet* humongous_set,
+ HeapRegionManager* hrm) :
+ _old_set(old_set), _humongous_set(humongous_set), _hrm(hrm),
+ _old_count(), _humongous_count(), _free_count(){ }
+
+ bool doHeapRegion(HeapRegion* hr) {
+ if (hr->is_young()) {
+ // TODO
+ } else if (hr->is_humongous()) {
+ assert(hr->containing_set() == _humongous_set, "Heap region %u is humongous but not in humongous set.", hr->hrm_index());
+ _humongous_count++;
+ } else if (hr->is_empty()) {
+ assert(_hrm->is_free(hr), "Heap region %u is empty but not on the free list.", hr->hrm_index());
+ _free_count++;
+ } else if (hr->is_old()) {
+ assert(hr->containing_set() == _old_set, "Heap region %u is old but not in the old set.", hr->hrm_index());
+ _old_count++;
+ } else {
+ // There are no other valid region types. Check for one invalid
+ // one we can identify: pinned without old or humongous set.
+ assert(!hr->is_pinned(), "Heap region %u is pinned but not old (archive) or humongous.", hr->hrm_index());
+ ShouldNotReachHere();
+ }
+ return false;
+ }
+
+ void verify_counts(HeapRegionSet* old_set, HeapRegionSet* humongous_set, HeapRegionManager* free_list) {
+ guarantee(old_set->length() == _old_count, "Old set count mismatch. Expected %u, actual %u.", old_set->length(), _old_count);
+ guarantee(humongous_set->length() == _humongous_count, "Hum set count mismatch. Expected %u, actual %u.", humongous_set->length(), _humongous_count);
+ guarantee(free_list->num_free_regions() == _free_count, "Free list count mismatch. Expected %u, actual %u.", free_list->num_free_regions(), _free_count);
+ }
+};
+
+void G1HeapVerifier::verify_region_sets() {
+ assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */);
+
+ // First, check the explicit lists.
+ _g1h->_hrm.verify();
+ {
+ // Given that a concurrent operation might be adding regions to
+ // the secondary free list we have to take the lock before
+ // verifying it.
+ MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag);
+ _g1h->_secondary_free_list.verify_list();
+ }
+
+ // If a concurrent region freeing operation is in progress it will
+ // be difficult to correctly attributed any free regions we come
+ // across to the correct free list given that they might belong to
+ // one of several (free_list, secondary_free_list, any local lists,
+ // etc.). So, if that's the case we will skip the rest of the
+ // verification operation. Alternatively, waiting for the concurrent
+ // operation to complete will have a non-trivial effect on the GC's
+ // operation (no concurrent operation will last longer than the
+ // interval between two calls to verification) and it might hide
+ // any issues that we would like to catch during testing.
+ if (_g1h->free_regions_coming()) {
+ return;
+ }
+
+ // Make sure we append the secondary_free_list on the free_list so
+ // that all free regions we will come across can be safely
+ // attributed to the free_list.
+ _g1h->append_secondary_free_list_if_not_empty_with_lock();
+
+ // Finally, make sure that the region accounting in the lists is
+ // consistent with what we see in the heap.
+
+ VerifyRegionListsClosure cl(&_g1h->_old_set, &_g1h->_humongous_set, &_g1h->_hrm);
+ _g1h->heap_region_iterate(&cl);
+ cl.verify_counts(&_g1h->_old_set, &_g1h->_humongous_set, &_g1h->_hrm);
+}
+
+void G1HeapVerifier::prepare_for_verify() {
+ if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) {
+ _g1h->ensure_parsability(false);
+ }
+ _g1h->g1_rem_set()->prepare_for_verify();
+}
+
+double G1HeapVerifier::verify(bool guard, const char* msg) {
+ double verify_time_ms = 0.0;
+
+ if (guard && _g1h->total_collections() >= VerifyGCStartAt) {
+ double verify_start = os::elapsedTime();
+ HandleMark hm; // Discard invalid handles created during verification
+ prepare_for_verify();
+ Universe::verify(VerifyOption_G1UsePrevMarking, msg);
+ verify_time_ms = (os::elapsedTime() - verify_start) * 1000;
+ }
+
+ return verify_time_ms;
+}
+
+void G1HeapVerifier::verify_before_gc() {
+ double verify_time_ms = verify(VerifyBeforeGC, "Before GC");
+ _g1h->g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms);
+}
+
+void G1HeapVerifier::verify_after_gc() {
+ double verify_time_ms = verify(VerifyAfterGC, "After GC");
+ _g1h->g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms);
+}
+
+
+#ifndef PRODUCT
+class G1VerifyCardTableCleanup: public HeapRegionClosure {
+ G1HeapVerifier* _verifier;
+ G1SATBCardTableModRefBS* _ct_bs;
+public:
+ G1VerifyCardTableCleanup(G1HeapVerifier* verifier, G1SATBCardTableModRefBS* ct_bs)
+ : _verifier(verifier), _ct_bs(ct_bs) { }
+ virtual bool doHeapRegion(HeapRegion* r) {
+ if (r->is_survivor()) {
+ _verifier->verify_dirty_region(r);
+ } else {
+ _verifier->verify_not_dirty_region(r);
+ }
+ return false;
+ }
+};
+
+void G1HeapVerifier::verify_card_table_cleanup() {
+ if (G1VerifyCTCleanup || VerifyAfterGC) {
+ G1VerifyCardTableCleanup cleanup_verifier(this, _g1h->g1_barrier_set());
+ _g1h->heap_region_iterate(&cleanup_verifier);
+ }
+}
+
+void G1HeapVerifier::verify_not_dirty_region(HeapRegion* hr) {
+ // All of the region should be clean.
+ G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
+ MemRegion mr(hr->bottom(), hr->end());
+ ct_bs->verify_not_dirty_region(mr);
+}
+
+void G1HeapVerifier::verify_dirty_region(HeapRegion* hr) {
+ // We cannot guarantee that [bottom(),end()] is dirty. Threads
+ // dirty allocated blocks as they allocate them. The thread that
+ // retires each region and replaces it with a new one will do a
+ // maximal allocation to fill in [pre_dummy_top(),end()] but will
+ // not dirty that area (one less thing to have to do while holding
+ // a lock). So we can only verify that [bottom(),pre_dummy_top()]
+ // is dirty.
+ G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
+ MemRegion mr(hr->bottom(), hr->pre_dummy_top());
+ if (hr->is_young()) {
+ ct_bs->verify_g1_young_region(mr);
+ } else {
+ ct_bs->verify_dirty_region(mr);
+ }
+}
+
+void G1HeapVerifier::verify_dirty_young_list(HeapRegion* head) {
+ G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
+ for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) {
+ verify_dirty_region(hr);
+ }
+}
+
+void G1HeapVerifier::verify_dirty_young_regions() {
+ verify_dirty_young_list(_g1h->young_list()->first_region());
+}
+
+bool G1HeapVerifier::verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap,
+ HeapWord* tams, HeapWord* end) {
+ guarantee(tams <= end,
+ "tams: " PTR_FORMAT " end: " PTR_FORMAT, p2i(tams), p2i(end));
+ HeapWord* result = bitmap->getNextMarkedWordAddress(tams, end);
+ if (result < end) {
+ log_info(gc, verify)("## wrong marked address on %s bitmap: " PTR_FORMAT, bitmap_name, p2i(result));
+ log_info(gc, verify)("## %s tams: " PTR_FORMAT " end: " PTR_FORMAT, bitmap_name, p2i(tams), p2i(end));
+ return false;
+ }
+ return true;
+}
+
+bool G1HeapVerifier::verify_bitmaps(const char* caller, HeapRegion* hr) {
+ CMBitMapRO* prev_bitmap = _g1h->concurrent_mark()->prevMarkBitMap();
+ CMBitMapRO* next_bitmap = (CMBitMapRO*) _g1h->concurrent_mark()->nextMarkBitMap();
+
+ HeapWord* bottom = hr->bottom();
+ HeapWord* ptams = hr->prev_top_at_mark_start();
+ HeapWord* ntams = hr->next_top_at_mark_start();
+ HeapWord* end = hr->end();
+
+ bool res_p = verify_no_bits_over_tams("prev", prev_bitmap, ptams, end);
+
+ bool res_n = true;
+ // We reset mark_in_progress() before we reset _cmThread->in_progress() and in this window
+ // we do the clearing of the next bitmap concurrently. Thus, we can not verify the bitmap
+ // if we happen to be in that state.
+ if (_g1h->collector_state()->mark_in_progress() || !_g1h->_cmThread->in_progress()) {
+ res_n = verify_no_bits_over_tams("next", next_bitmap, ntams, end);
+ }
+ if (!res_p || !res_n) {
+ log_info(gc, verify)("#### Bitmap verification failed for " HR_FORMAT, HR_FORMAT_PARAMS(hr));
+ log_info(gc, verify)("#### Caller: %s", caller);
+ return false;
+ }
+ return true;
+}
+
+void G1HeapVerifier::check_bitmaps(const char* caller, HeapRegion* hr) {
+ if (!G1VerifyBitmaps) return;
+
+ guarantee(verify_bitmaps(caller, hr), "bitmap verification");
+}
+
+class G1VerifyBitmapClosure : public HeapRegionClosure {
+private:
+ const char* _caller;
+ G1HeapVerifier* _verifier;
+ bool _failures;
+
+public:
+ G1VerifyBitmapClosure(const char* caller, G1HeapVerifier* verifier) :
+ _caller(caller), _verifier(verifier), _failures(false) { }
+
+ bool failures() { return _failures; }
+
+ virtual bool doHeapRegion(HeapRegion* hr) {
+ bool result = _verifier->verify_bitmaps(_caller, hr);
+ if (!result) {
+ _failures = true;
+ }
+ return false;
+ }
+};
+
+void G1HeapVerifier::check_bitmaps(const char* caller) {
+ if (!G1VerifyBitmaps) return;
+
+ G1VerifyBitmapClosure cl(caller, this);
+ _g1h->heap_region_iterate(&cl);
+ guarantee(!cl.failures(), "bitmap verification");
+}
+
+class G1CheckCSetFastTableClosure : public HeapRegionClosure {
+ private:
+ bool _failures;
+ public:
+ G1CheckCSetFastTableClosure() : HeapRegionClosure(), _failures(false) { }
+
+ virtual bool doHeapRegion(HeapRegion* hr) {
+ uint i = hr->hrm_index();
+ InCSetState cset_state = (InCSetState) G1CollectedHeap::heap()->_in_cset_fast_test.get_by_index(i);
+ if (hr->is_humongous()) {
+ if (hr->in_collection_set()) {
+ log_info(gc, verify)("## humongous region %u in CSet", i);
+ _failures = true;
+ return true;
+ }
+ if (cset_state.is_in_cset()) {
+ log_info(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for humongous region %u", cset_state.value(), i);
+ _failures = true;
+ return true;
+ }
+ if (hr->is_continues_humongous() && cset_state.is_humongous()) {
+ log_info(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for continues humongous region %u", cset_state.value(), i);
+ _failures = true;
+ return true;
+ }
+ } else {
+ if (cset_state.is_humongous()) {
+ log_info(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for non-humongous region %u", cset_state.value(), i);
+ _failures = true;
+ return true;
+ }
+ if (hr->in_collection_set() != cset_state.is_in_cset()) {
+ log_info(gc, verify)("## in CSet %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
+ hr->in_collection_set(), cset_state.value(), i);
+ _failures = true;
+ return true;
+ }
+ if (cset_state.is_in_cset()) {
+ if (hr->is_young() != (cset_state.is_young())) {
+ log_info(gc, verify)("## is_young %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
+ hr->is_young(), cset_state.value(), i);
+ _failures = true;
+ return true;
+ }
+ if (hr->is_old() != (cset_state.is_old())) {
+ log_info(gc, verify)("## is_old %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
+ hr->is_old(), cset_state.value(), i);
+ _failures = true;
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ bool failures() const { return _failures; }
+};
+
+bool G1HeapVerifier::check_cset_fast_test() {
+ G1CheckCSetFastTableClosure cl;
+ _g1h->_hrm.iterate(&cl);
+ return !cl.failures();
+}
+#endif // PRODUCT
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1HeapVerifier.hpp Tue Jan 26 15:28:31 2016 +0100
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_GC_G1_G1HEAPVERIFIER_HPP
+#define SHARE_VM_GC_G1_G1HEAPVERIFIER_HPP
+
+#include "gc/g1/heapRegionSet.hpp"
+#include "memory/allocation.hpp"
+#include "memory/universe.hpp"
+
+class G1CollectedHeap;
+
+class G1HeapVerifier : public CHeapObj<mtGC> {
+private:
+ G1CollectedHeap* _g1h;
+
+ // verify_region_sets() performs verification over the region
+ // lists. It will be compiled in the product code to be used when
+ // necessary (i.e., during heap verification).
+ void verify_region_sets();
+
+public:
+
+ G1HeapVerifier(G1CollectedHeap* heap) : _g1h(heap) { }
+
+ // Perform verification.
+
+ // vo == UsePrevMarking -> use "prev" marking information,
+ // vo == UseNextMarking -> use "next" marking information
+ // vo == UseMarkWord -> use the mark word in the object header
+ //
+ // NOTE: Only the "prev" marking information is guaranteed to be
+ // consistent most of the time, so most calls to this should use
+ // vo == UsePrevMarking.
+ // Currently, there is only one case where this is called with
+ // vo == UseNextMarking, which is to verify the "next" marking
+ // information at the end of remark.
+ // Currently there is only one place where this is called with
+ // vo == UseMarkWord, which is to verify the marking during a
+ // full GC.
+ void verify(VerifyOption vo);
+
+ // verify_region_sets_optional() is planted in the code for
+ // list verification in non-product builds (and it can be enabled in
+ // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1).
+#if HEAP_REGION_SET_FORCE_VERIFY
+ void verify_region_sets_optional() {
+ verify_region_sets();
+ }
+#else // HEAP_REGION_SET_FORCE_VERIFY
+ void verify_region_sets_optional() { }
+#endif // HEAP_REGION_SET_FORCE_VERIFY
+
+ void prepare_for_verify();
+ double verify(bool guard, const char* msg);
+ void verify_before_gc();
+ void verify_after_gc();
+
+#ifndef PRODUCT
+ // Make sure that the given bitmap has no marked objects in the
+ // range [from,limit). If it does, print an error message and return
+ // false. Otherwise, just return true. bitmap_name should be "prev"
+ // or "next".
+ bool verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap,
+ HeapWord* from, HeapWord* limit);
+
+ // Verify that the prev / next bitmap range [tams,end) for the given
+ // region has no marks. Return true if all is well, false if errors
+ // are detected.
+ bool verify_bitmaps(const char* caller, HeapRegion* hr);
+#endif // PRODUCT
+
+ // If G1VerifyBitmaps is set, verify that the marking bitmaps for
+ // the given region do not have any spurious marks. If errors are
+ // detected, print appropriate error messages and crash.
+ void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN;
+
+ // If G1VerifyBitmaps is set, verify that the marking bitmaps do not
+ // have any spurious marks. If errors are detected, print
+ // appropriate error messages and crash.
+ void check_bitmaps(const char* caller) PRODUCT_RETURN;
+
+ // Do sanity check on the contents of the in-cset fast test table.
+ bool check_cset_fast_test() PRODUCT_RETURN_( return true; );
+
+ void verify_card_table_cleanup() PRODUCT_RETURN;
+
+ void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN;
+ void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN;
+ void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN;
+ void verify_dirty_young_regions() PRODUCT_RETURN;
+};
+
+#endif // SHARE_VM_GC_G1_G1HEAPVERIFIER_HPP