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0N/A
1879N/A#ifndef SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP
1879N/A#define SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP
1879N/A
1879N/A#include "memory/cardTableRS.hpp"
1879N/A#include "memory/defNewGeneration.hpp"
1879N/A#include "memory/space.hpp"
1879N/A
113N/A// Methods of protected closure types
113N/A
113N/Atemplate <class T>
113N/Ainline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) {
113N/A#ifdef ASSERT
113N/A {
113N/A // We never expect to see a null reference being processed
113N/A // as a weak reference.
113N/A assert (!oopDesc::is_null(*p), "expected non-null ref");
113N/A oop obj = oopDesc::load_decode_heap_oop_not_null(p);
113N/A assert (obj->is_oop(), "expected an oop while scanning weak refs");
113N/A }
113N/A#endif // ASSERT
113N/A
113N/A _cl->do_oop_nv(p);
113N/A
113N/A // Card marking is trickier for weak refs.
113N/A // This oop is a 'next' field which was filled in while we
113N/A // were discovering weak references. While we might not need
113N/A // to take a special action to keep this reference alive, we
113N/A // will need to dirty a card as the field was modified.
113N/A //
113N/A // Alternatively, we could create a method which iterates through
113N/A // each generation, allowing them in turn to examine the modified
113N/A // field.
113N/A //
113N/A // We could check that p is also in an older generation, but
113N/A // dirty cards in the youngest gen are never scanned, so the
113N/A // extra check probably isn't worthwhile.
113N/A if (Universe::heap()->is_in_reserved(p)) {
113N/A oop obj = oopDesc::load_decode_heap_oop_not_null(p);
113N/A _rs->inline_write_ref_field_gc(p, obj);
113N/A }
0N/A}
0N/A
113N/Atemplate <class T>
113N/Ainline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) {
113N/A#ifdef ASSERT
113N/A {
113N/A // We never expect to see a null reference being processed
113N/A // as a weak reference.
113N/A assert (!oopDesc::is_null(*p), "expected non-null ref");
113N/A oop obj = oopDesc::load_decode_heap_oop_not_null(p);
113N/A assert (obj->is_oop(), "expected an oop while scanning weak refs");
0N/A }
113N/A#endif // ASSERT
113N/A
113N/A _cl->do_oop_nv(p);
0N/A
113N/A // Optimized for Defnew generation if it's the youngest generation:
113N/A // we set a younger_gen card if we have an older->youngest
113N/A // generation pointer.
113N/A oop obj = oopDesc::load_decode_heap_oop_not_null(p);
113N/A if (((HeapWord*)obj < _boundary) && Universe::heap()->is_in_reserved(p)) {
113N/A _rs->inline_write_ref_field_gc(p, obj);
0N/A }
0N/A}
1879N/A
1879N/A#endif // SHARE_VM_MEMORY_DEFNEWGENERATION_INLINE_HPP