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8079315: UseCondCardMark broken in conjunction with CMS precleaning on x86

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Add the necessary StoreLoad barrier in interpreter, C1 and C2 for x86

Reviewed-by: tschatzl
This commit is contained in:
Andrew Haley 2015-06-19 09:41:50 +02:00
parent 6cb9f920e1
commit b387838cea
3 changed files with 11 additions and 0 deletions
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3
hotspot/src/cpu/x86/vm/macroAssembler_x86.cpp
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@ -4299,6 +4299,9 @@ void MacroAssembler::store_check(Register obj) {
int dirty = CardTableModRefBS::dirty_card_val();
if (UseCondCardMark) {
Label L_already_dirty;
if (UseConcMarkSweepGC) {
membar(Assembler::StoreLoad);
}
cmpb(card_addr, dirty);
jcc(Assembler::equal, L_already_dirty);
movb(card_addr, dirty);

3
hotspot/src/share/vm/c1/c1_LIRGenerator.cpp
View file

@ -1619,6 +1619,9 @@ void LIRGenerator::CardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc*
LIR_Opr dirty = LIR_OprFact::intConst(CardTableModRefBS::dirty_card_val());
if (UseCondCardMark) {
LIR_Opr cur_value = new_register(T_INT);
if (UseConcMarkSweepGC) {
__ membar_storeload();
}
__ move(card_addr, cur_value);
LabelObj* L_already_dirty = new LabelObj();

5
hotspot/src/share/vm/opto/graphKit.cpp
View file

@ -3803,6 +3803,11 @@ void GraphKit::write_barrier_post(Node* oop_store,
Node* zero = __ ConI(0); // Dirty card value
BasicType bt = T_BYTE;
if (UseConcMarkSweepGC && UseCondCardMark) {
insert_mem_bar(Op_MemBarVolatile); // StoreLoad barrier
__ sync_kit(this);
}
if (UseCondCardMark) {
// The classic GC reference write barrier is typically implemented
// as a store into the global card mark table. Unfortunately