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src/hotspot/share/gc/shenandoah/shenandoahRootVerifier.cpp

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 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 
 26 #include "precompiled.hpp"
 27 
 28 
 29 #include "classfile/classLoaderDataGraph.hpp"
 30 #include "code/codeCache.hpp"
 31 #include "gc/shenandoah/shenandoahAsserts.hpp"
 32 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
 33 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
 34 #include "gc/shenandoah/shenandoahRootVerifier.hpp"

 35 #include "gc/shenandoah/shenandoahStringDedup.hpp"
 36 #include "gc/shenandoah/shenandoahUtils.hpp"
 37 #include "gc/shared/oopStorage.inline.hpp"
 38 #include "gc/shared/oopStorageSet.hpp"
 39 #include "runtime/jniHandles.hpp"
 40 #include "runtime/thread.hpp"
 41 #include "utilities/debug.hpp"
 42 #include "utilities/enumIterator.hpp"
 43 
 44 ShenandoahGCStateResetter::ShenandoahGCStateResetter() :
 45   _heap(ShenandoahHeap::heap()),
 46   _gc_state(_heap->gc_state()) {
 47   _heap->_gc_state.clear();
 48 }
 49 
 50 ShenandoahGCStateResetter::~ShenandoahGCStateResetter() {
 51   _heap->_gc_state.set(_gc_state);
 52   assert(_heap->gc_state() == _gc_state, "Should be restored");
 53 }
 54 
 55 void ShenandoahRootVerifier::roots_do(OopClosure* oops) {
 56   ShenandoahGCStateResetter resetter;
 57   shenandoah_assert_safepoint();
 58 
 59   CodeBlobToOopClosure blobs(oops, !CodeBlobToOopClosure::FixRelocations);
 60   CodeCache::blobs_do(&blobs);
 61 
 62   CLDToOopClosure clds(oops, ClassLoaderData::_claim_none);
 63   ClassLoaderDataGraph::cld_do(&clds);
 64 
 65   for (auto id : EnumRange<OopStorageSet::StrongId>()) {
 66     OopStorageSet::storage(id)->oops_do(oops);
 67   }
 68 






 69   // Do thread roots the last. This allows verification code to find
 70   // any broken objects from those special roots first, not the accidental
 71   // dangling reference from the thread root.
 72   Threads::possibly_parallel_oops_do(true, oops, NULL);
 73 }
 74 
 75 void ShenandoahRootVerifier::strong_roots_do(OopClosure* oops) {
 76   ShenandoahGCStateResetter resetter;
 77   shenandoah_assert_safepoint();
 78 
 79   CLDToOopClosure clds(oops, ClassLoaderData::_claim_none);
 80   ClassLoaderDataGraph::always_strong_cld_do(&clds);
 81 
 82   for (auto id : EnumRange<OopStorageSet::StrongId>()) {
 83     OopStorageSet::storage(id)->oops_do(oops);
 84   }






 85   // Do thread roots the last. This allows verification code to find
 86   // any broken objects from those special roots first, not the accidental
 87   // dangling reference from the thread root.
 88   CodeBlobToOopClosure blobs(oops, !CodeBlobToOopClosure::FixRelocations);
 89   Threads::possibly_parallel_oops_do(true, oops, &blobs);
 90 }

 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 
 26 #include "precompiled.hpp"
 27 
 28 
 29 #include "classfile/classLoaderDataGraph.hpp"
 30 #include "code/codeCache.hpp"
 31 #include "gc/shenandoah/shenandoahAsserts.hpp"
 32 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
 33 #include "gc/shenandoah/shenandoahPhaseTimings.hpp"
 34 #include "gc/shenandoah/shenandoahRootVerifier.hpp"
 35 #include "gc/shenandoah/shenandoahScanRemembered.inline.hpp"
 36 #include "gc/shenandoah/shenandoahStringDedup.hpp"
 37 #include "gc/shenandoah/shenandoahUtils.hpp"
 38 #include "gc/shared/oopStorage.inline.hpp"
 39 #include "gc/shared/oopStorageSet.hpp"
 40 #include "runtime/jniHandles.hpp"
 41 #include "runtime/thread.hpp"
 42 #include "utilities/debug.hpp"
 43 #include "utilities/enumIterator.hpp"
 44 
 45 ShenandoahGCStateResetter::ShenandoahGCStateResetter() :
 46   _heap(ShenandoahHeap::heap()),
 47   _gc_state(_heap->gc_state()) {
 48   _heap->_gc_state.clear();
 49 }
 50 
 51 ShenandoahGCStateResetter::~ShenandoahGCStateResetter() {
 52   _heap->_gc_state.set(_gc_state);
 53   assert(_heap->gc_state() == _gc_state, "Should be restored");
 54 }
 55 
 56 void ShenandoahRootVerifier::roots_do(OopIterateClosure* oops) {
 57   ShenandoahGCStateResetter resetter;
 58   shenandoah_assert_safepoint();
 59 
 60   CodeBlobToOopClosure blobs(oops, !CodeBlobToOopClosure::FixRelocations);
 61   CodeCache::blobs_do(&blobs);
 62 
 63   CLDToOopClosure clds(oops, ClassLoaderData::_claim_none);
 64   ClassLoaderDataGraph::cld_do(&clds);
 65 
 66   for (auto id : EnumRange<OopStorageSet::StrongId>()) {
 67     OopStorageSet::storage(id)->oops_do(oops);
 68   }
 69 
 70   ShenandoahHeap* heap = ShenandoahHeap::heap();
 71   if (heap->mode()->is_generational() && heap->is_gc_generation_young()) {
 72     shenandoah_assert_safepoint();
 73     heap->card_scan()->roots_do(oops);
 74   }
 75 
 76   // Do thread roots the last. This allows verification code to find
 77   // any broken objects from those special roots first, not the accidental
 78   // dangling reference from the thread root.
 79   Threads::possibly_parallel_oops_do(true, oops, NULL);
 80 }
 81 
 82 void ShenandoahRootVerifier::strong_roots_do(OopIterateClosure* oops) {
 83   ShenandoahGCStateResetter resetter;
 84   shenandoah_assert_safepoint();
 85 
 86   CLDToOopClosure clds(oops, ClassLoaderData::_claim_none);
 87   ClassLoaderDataGraph::always_strong_cld_do(&clds);
 88 
 89   for (auto id : EnumRange<OopStorageSet::StrongId>()) {
 90     OopStorageSet::storage(id)->oops_do(oops);
 91   }
 92 
 93   ShenandoahHeap* heap = ShenandoahHeap::heap();
 94   if (heap->mode()->is_generational() && heap->is_gc_generation_young()) {
 95     heap->card_scan()->roots_do(oops);
 96   }
 97 
 98   // Do thread roots the last. This allows verification code to find
 99   // any broken objects from those special roots first, not the accidental
100   // dangling reference from the thread root.
101   CodeBlobToOopClosure blobs(oops, !CodeBlobToOopClosure::FixRelocations);
102   Threads::possibly_parallel_oops_do(true, oops, &blobs);
103 }
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