8230565: ZGC: Redesign C2 load barrier to expand on the MachNode level
Reviewed-by: pliden, stefank, neliasso
Contributed-by: erik.osterlund@oracle.com, per.liden@oracle.com, stefan.karlsson@oracle.com, nils.eliasson@oracle.com
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#ifndef SHARE_GC_Z_C2_ZBARRIERSETC2_HPP
#define SHARE_GC_Z_C2_ZBARRIERSETC2_HPP
#include "gc/shared/c2/barrierSetC2.hpp"
#include "memory/allocation.hpp"
#include "opto/node.hpp"
#include "utilities/growableArray.hpp"
const uint8_t ZLoadBarrierStrong = 1;
const uint8_t ZLoadBarrierWeak = 2;
const uint8_t ZLoadBarrierElided = 3;
class ZLoadBarrierStubC2 : public ResourceObj {
private:
const MachNode* _node;
const Address _ref_addr;
const Register _ref;
const Register _tmp;
const bool _weak;
Label _entry;
Label _continuation;
ZLoadBarrierStubC2(const MachNode* node, Address ref_addr, Register ref, Register tmp, bool weak);
public:
static ZLoadBarrierStubC2* create(const MachNode* node, Address ref_addr, Register ref, Register tmp, bool weak);
Address ref_addr() const;
Register ref() const;
Register tmp() const;
address slow_path() const;
RegMask& live() const;
Label* entry();
Label* continuation();
};
class ZBarrierSetC2 : public BarrierSetC2 {
private:
void compute_liveness_at_stubs() const;
void analyze_dominating_barriers() const;
protected:
virtual Node* load_at_resolved(C2Access& access, const Type* val_type) const;
virtual Node* atomic_cmpxchg_val_at_resolved(C2AtomicParseAccess& access,
Node* expected_val,
Node* new_val,
const Type* val_type) const;
virtual Node* atomic_cmpxchg_bool_at_resolved(C2AtomicParseAccess& access,
Node* expected_val,
Node* new_val,
const Type* value_type) const;
virtual Node* atomic_xchg_at_resolved(C2AtomicParseAccess& access,
Node* new_val,
const Type* val_type) const;
public:
virtual void* create_barrier_state(Arena* comp_arena) const;
virtual bool array_copy_requires_gc_barriers(bool tightly_coupled_alloc,
BasicType type,
bool is_clone,
ArrayCopyPhase phase) const;
virtual void late_barrier_analysis() const;
virtual int estimate_stub_size() const;
virtual void emit_stubs(CodeBuffer& cb) const;
};
#endif // SHARE_GC_Z_C2_ZBARRIERSETC2_HPP