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8033380: Experimental VM flag to enforce access atomicity

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-XX:+AlwaysAtomicAccesses to unconditionally enforce the access atomicity.

Reviewed-by: roland, kvn, iveresov
This commit is contained in:
Aleksey Shipilev 2014-03-03 15:54:45 +04:00
parent 0b6a5f744a
commit c4bd0f58d3
4 changed files with 37 additions and 12 deletions
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6
hotspot/src/share/vm/opto/parse3.cpp
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@ -233,7 +233,8 @@ void Parse::do_get_xxx(Node* obj, ciField* field, bool is_field) {
// Build the load.
//
MemNode::MemOrd mo = is_vol ? MemNode::acquire : MemNode::unordered;
Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, is_vol);
bool needs_atomic_access = is_vol || AlwaysAtomicAccesses;
Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, needs_atomic_access);
// Adjust Java stack
if (type2size[bt] == 1)
@ -314,7 +315,8 @@ void Parse::do_put_xxx(Node* obj, ciField* field, bool is_field) {
}
store = store_oop_to_object(control(), obj, adr, adr_type, val, field_type, bt, mo);
} else {
store = store_to_memory(control(), adr, val, bt, adr_type, mo, is_vol);
bool needs_atomic_access = is_vol || AlwaysAtomicAccesses;
store = store_to_memory(control(), adr, val, bt, adr_type, mo, needs_atomic_access);
}
// If reference is volatile, prevent following volatiles ops from