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8165808: Add release barriers when allocating objects with concurrent collection

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Add release_set_klass, use in slow-path allocators.

Reviewed-by: jmasa, dholmes
This commit is contained in:
Kim Barrett 2016-09-15 12:10:43 -04:00
parent 94bbcbd378
commit b77d0de3d9
4 changed files with 51 additions and 40 deletions
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22
hotspot/src/share/vm/oops/oop.inline.hpp
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@ -129,10 +129,14 @@ narrowKlass* oopDesc::compressed_klass_addr() {
return &_metadata._compressed_klass;
}
#define CHECK_SET_KLASS(k) \
do { \
assert(Universe::is_bootstrapping() || k != NULL, "NULL Klass"); \
assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass"); \
} while (0)
void oopDesc::set_klass(Klass* k) {
// since klasses are promoted no store check is needed
assert(Universe::is_bootstrapping() || k != NULL, "must be a real Klass*");
assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass*");
CHECK_SET_KLASS(k);
if (UseCompressedClassPointers) {
*compressed_klass_addr() = Klass::encode_klass_not_null(k);
} else {
@ -140,6 +144,18 @@ void oopDesc::set_klass(Klass* k) {
}
}
void oopDesc::release_set_klass(Klass* k) {
CHECK_SET_KLASS(k);
if (UseCompressedClassPointers) {
OrderAccess::release_store(compressed_klass_addr(),
Klass::encode_klass_not_null(k));
} else {
OrderAccess::release_store_ptr(klass_addr(), k);
}
}
#undef CHECK_SET_KLASS
int oopDesc::klass_gap() const {
return *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes());
}