src/cpu/x86/vm/templateTable_x86_64.cpp
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rev 4468 : 8012335: G1: Fix bug with compressed oops in template interpreter on x86 and sparc.
Summary: In do_oop_store the uncompressed value of the oop being stored needs to be preserved and passed to g1_write_barrier_post. This is necessary for the heap region cross check to work correctly.
Reviewed-by: coleenp, johnc
Contributed-by: Martin Doerr <martin.doerr@sap.com>
@@ -154,18 +154,23 @@
val != noreg /* tosca_live */,
false /* expand_call */);
if (val == noreg) {
__ store_heap_oop_null(Address(rdx, 0));
} else {
+ // G1 barrier needs uncompressed oop for region cross check.
+ Register new_val = val;
+ if (UseCompressedOops) {
+ new_val = rbx;
+ __ movptr(new_val, val);
+ }
__ store_heap_oop(Address(rdx, 0), val);
__ g1_write_barrier_post(rdx /* store_adr */,
- val /* new_val */,
+ new_val /* new_val */,
r15_thread /* thread */,
r8 /* tmp */,
rbx /* tmp2 */);
}
-
}
break;
#endif // SERIALGC
case BarrierSet::CardTableModRef:
case BarrierSet::CardTableExtension: