4542 // Get the header out of the object, use LoadMarkNode when available
4543 Node* header_addr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes());
4544 // The control of the load must be null. Otherwise, the load can move before
4545 // the null check after castPP removal.
4546 Node* no_ctrl = nullptr;
4547 Node* header = make_load(no_ctrl, header_addr, TypeX_X, TypeX_X->basic_type(), MemNode::unordered);
4548
4549 // Test the header to see if it is unlocked.
4550 Node *lock_mask = _gvn.MakeConX(markWord::lock_mask_in_place);
4551 Node *lmasked_header = _gvn.transform(new AndXNode(header, lock_mask));
4552 Node *unlocked_val = _gvn.MakeConX(markWord::unlocked_value);
4553 Node *chk_unlocked = _gvn.transform(new CmpXNode( lmasked_header, unlocked_val));
4554 Node *test_unlocked = _gvn.transform(new BoolNode( chk_unlocked, BoolTest::ne));
4555
4556 generate_slow_guard(test_unlocked, slow_region);
4557
4558 // Get the hash value and check to see that it has been properly assigned.
4559 // We depend on hash_mask being at most 32 bits and avoid the use of
4560 // hash_mask_in_place because it could be larger than 32 bits in a 64-bit
4561 // vm: see markWord.hpp.
4562 Node *hash_mask = _gvn.intcon(markWord::hash_mask);
4563 Node *hash_shift = _gvn.intcon(markWord::hash_shift);
4564 Node *hshifted_header= _gvn.transform(new URShiftXNode(header, hash_shift));
4565 // This hack lets the hash bits live anywhere in the mark object now, as long
4566 // as the shift drops the relevant bits into the low 32 bits. Note that
4567 // Java spec says that HashCode is an int so there's no point in capturing
4568 // an 'X'-sized hashcode (32 in 32-bit build or 64 in 64-bit build).
4569 hshifted_header = ConvX2I(hshifted_header);
4570 Node *hash_val = _gvn.transform(new AndINode(hshifted_header, hash_mask));
4571
4572 Node *no_hash_val = _gvn.intcon(markWord::no_hash);
4573 Node *chk_assigned = _gvn.transform(new CmpINode( hash_val, no_hash_val));
4574 Node *test_assigned = _gvn.transform(new BoolNode( chk_assigned, BoolTest::eq));
4575
4576 generate_slow_guard(test_assigned, slow_region);
4577
4578 Node* init_mem = reset_memory();
4579 // fill in the rest of the null path:
4580 result_io ->init_req(_null_path, i_o());
4581 result_mem->init_req(_null_path, init_mem);
4582
4583 result_val->init_req(_fast_path, hash_val);
|
4542 // Get the header out of the object, use LoadMarkNode when available
4543 Node* header_addr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes());
4544 // The control of the load must be null. Otherwise, the load can move before
4545 // the null check after castPP removal.
4546 Node* no_ctrl = nullptr;
4547 Node* header = make_load(no_ctrl, header_addr, TypeX_X, TypeX_X->basic_type(), MemNode::unordered);
4548
4549 // Test the header to see if it is unlocked.
4550 Node *lock_mask = _gvn.MakeConX(markWord::lock_mask_in_place);
4551 Node *lmasked_header = _gvn.transform(new AndXNode(header, lock_mask));
4552 Node *unlocked_val = _gvn.MakeConX(markWord::unlocked_value);
4553 Node *chk_unlocked = _gvn.transform(new CmpXNode( lmasked_header, unlocked_val));
4554 Node *test_unlocked = _gvn.transform(new BoolNode( chk_unlocked, BoolTest::ne));
4555
4556 generate_slow_guard(test_unlocked, slow_region);
4557
4558 // Get the hash value and check to see that it has been properly assigned.
4559 // We depend on hash_mask being at most 32 bits and avoid the use of
4560 // hash_mask_in_place because it could be larger than 32 bits in a 64-bit
4561 // vm: see markWord.hpp.
4562 Node *hash_mask = _gvn.intcon(UseCompactObjectHeaders ? markWord::hash_mask_compact : markWord::hash_mask);
4563 Node *hash_shift = _gvn.intcon(UseCompactObjectHeaders ? markWord::hash_shift_compact : markWord::hash_shift);
4564 Node *hshifted_header= _gvn.transform(new URShiftXNode(header, hash_shift));
4565 // This hack lets the hash bits live anywhere in the mark object now, as long
4566 // as the shift drops the relevant bits into the low 32 bits. Note that
4567 // Java spec says that HashCode is an int so there's no point in capturing
4568 // an 'X'-sized hashcode (32 in 32-bit build or 64 in 64-bit build).
4569 hshifted_header = ConvX2I(hshifted_header);
4570 Node *hash_val = _gvn.transform(new AndINode(hshifted_header, hash_mask));
4571
4572 Node *no_hash_val = _gvn.intcon(markWord::no_hash);
4573 Node *chk_assigned = _gvn.transform(new CmpINode( hash_val, no_hash_val));
4574 Node *test_assigned = _gvn.transform(new BoolNode( chk_assigned, BoolTest::eq));
4575
4576 generate_slow_guard(test_assigned, slow_region);
4577
4578 Node* init_mem = reset_memory();
4579 // fill in the rest of the null path:
4580 result_io ->init_req(_null_path, i_o());
4581 result_mem->init_req(_null_path, init_mem);
4582
4583 result_val->init_req(_fast_path, hash_val);
|