8256038: G1: Improve comment about mark word handling of displaced mark words
Reviewed-by: sjohanss, kbarrett
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@ -490,12 +490,11 @@ oop G1ParScanThreadState::do_copy_to_survivor_space(G1HeapRegionAttr const regio
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age++;
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}
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if (old_mark.has_displaced_mark_helper()) {
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// In this case, we have to install the mark word first,
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// otherwise obj looks to be forwarded (the old mark word,
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// which contains the forward pointer, was copied)
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obj->set_mark(old_mark);
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// In this case, we have to install the old mark word containing the
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// displacement tag, and update the age in the displaced mark word.
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markWord new_mark = old_mark.displaced_mark_helper().set_age(age);
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old_mark.set_displaced_mark_helper(new_mark);
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obj->set_mark(old_mark);
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} else {
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obj->set_mark(old_mark.set_age(age));
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}
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