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src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp

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  99   // Ensure the object fit in the current region.
 100   while (!object_will_fit(size)) {
 101     switch_region();
 102   }
 103 
 104   // Store a forwarding pointer if the object should be moved.
 105   if ((HeapWord*)object != _compaction_top) {
 106     object->forward_to(oop(_compaction_top));
 107   } else {
 108     if (object->forwardee() != NULL) {
 109       // Object should not move but mark-word is used so it looks like the
 110       // object is forwarded. Need to clear the mark and it's no problem
 111       // since it will be restored by preserved marks. There is an exception
 112       // with BiasedLocking, in this case forwardee() will return NULL
 113       // even if the mark-word is used. This is no problem since
 114       // forwardee() will return NULL in the compaction phase as well.
 115       object->init_mark_raw();
 116     } else {
 117       // Make sure object has the correct mark-word set or that it will be
 118       // fixed when restoring the preserved marks.
 119       assert(object->mark_raw() == markWord::prototype_for_klass(object->klass()) || // Correct mark
 120              object->mark_must_be_preserved() || // Will be restored by PreservedMarksSet
 121              (UseBiasedLocking && object->has_bias_pattern_raw()), // Will be restored by BiasedLocking
 122              "should have correct prototype obj: " PTR_FORMAT " mark: " PTR_FORMAT " prototype: " PTR_FORMAT,
 123              p2i(object), object->mark_raw().value(), markWord::prototype_for_klass(object->klass()).value());
 124     }
 125     assert(object->forwardee() == NULL, "should be forwarded to NULL");
 126   }
 127 
 128   // Update compaction values.
 129   _compaction_top += size;
 130   if (_compaction_top > _threshold) {
 131     _threshold = _current_region->cross_threshold(_compaction_top - size, _compaction_top);
 132   }
 133 }
 134 
 135 void G1FullGCCompactionPoint::add(HeapRegion* hr) {
 136   _compaction_regions->append(hr);
 137 }
 138 
 139 void G1FullGCCompactionPoint::merge(G1FullGCCompactionPoint* other) {
 140    _compaction_regions->appendAll(other->regions());
 141 }
 142 
 143 HeapRegion* G1FullGCCompactionPoint::remove_last() {


  99   // Ensure the object fit in the current region.
 100   while (!object_will_fit(size)) {
 101     switch_region();
 102   }
 103 
 104   // Store a forwarding pointer if the object should be moved.
 105   if ((HeapWord*)object != _compaction_top) {
 106     object->forward_to(oop(_compaction_top));
 107   } else {
 108     if (object->forwardee() != NULL) {
 109       // Object should not move but mark-word is used so it looks like the
 110       // object is forwarded. Need to clear the mark and it's no problem
 111       // since it will be restored by preserved marks. There is an exception
 112       // with BiasedLocking, in this case forwardee() will return NULL
 113       // even if the mark-word is used. This is no problem since
 114       // forwardee() will return NULL in the compaction phase as well.
 115       object->init_mark_raw();
 116     } else {
 117       // Make sure object has the correct mark-word set or that it will be
 118       // fixed when restoring the preserved marks.
 119       assert(object->mark_raw() == markOopDesc::prototype_for_object(object) || // Correct mark
 120              object->mark_raw()->must_be_preserved(object) || // Will be restored by PreservedMarksSet
 121              (UseBiasedLocking && object->has_bias_pattern_raw()), // Will be restored by BiasedLocking
 122              "should have correct prototype obj: " PTR_FORMAT " mark: " PTR_FORMAT " prototype: " PTR_FORMAT,
 123              p2i(object), p2i(object->mark_raw()), p2i(markOopDesc::prototype_for_object(object)));
 124     }
 125     assert(object->forwardee() == NULL, "should be forwarded to NULL");
 126   }
 127 
 128   // Update compaction values.
 129   _compaction_top += size;
 130   if (_compaction_top > _threshold) {
 131     _threshold = _current_region->cross_threshold(_compaction_top - size, _compaction_top);
 132   }
 133 }
 134 
 135 void G1FullGCCompactionPoint::add(HeapRegion* hr) {
 136   _compaction_regions->append(hr);
 137 }
 138 
 139 void G1FullGCCompactionPoint::merge(G1FullGCCompactionPoint* other) {
 140    _compaction_regions->appendAll(other->regions());
 141 }
 142 
 143 HeapRegion* G1FullGCCompactionPoint::remove_last() {
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