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7121140: Allocation paths require explicit memory synchronization operations for RMO systems

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Adds store store barrier after initialization of header and body of objects.

Reviewed-by: never, kvn
This commit is contained in:
Roland Westrelin 2011-12-20 16:56:50 +01:00
parent e057d60ca1
commit 97439fb4ff
13 changed files with 196 additions and 7 deletions
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14
hotspot/src/share/vm/opto/memnode.hpp
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@ -918,6 +918,15 @@ public:
virtual int Opcode() const;
};
class MemBarStoreStoreNode: public MemBarNode {
public:
MemBarStoreStoreNode(Compile* C, int alias_idx, Node* precedent)
: MemBarNode(C, alias_idx, precedent) {
init_class_id(Class_MemBarStoreStore);
}
virtual int Opcode() const;
};
// Ordering between a volatile store and a following volatile load.
// Requires multi-CPU visibility?
class MemBarVolatileNode: public MemBarNode {
@ -950,6 +959,8 @@ class InitializeNode: public MemBarNode {
};
int _is_complete;
bool _does_not_escape;
public:
enum {
Control = TypeFunc::Control,
@ -989,6 +1000,9 @@ public:
void set_complete(PhaseGVN* phase);
void set_complete_with_arraycopy() { _is_complete = Complete | WithArraycopy; }
bool does_not_escape() { return _does_not_escape; }
void set_does_not_escape() { _does_not_escape = true; }
#ifdef ASSERT
// ensure all non-degenerate stores are ordered and non-overlapping
bool stores_are_sane(PhaseTransform* phase);