4747 // ...
4748 // [saved rbp ] <--- rbp
4749 void TemplateTable::monitorenter() {
4750 transition(atos, vtos);
4751
4752 // check for NULL object
4753 __ null_check(rax);
4754
4755 const Address monitor_block_top(
4756 rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
4757 const Address monitor_block_bot(
4758 rbp, frame::interpreter_frame_initial_sp_offset * wordSize);
4759 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
4760
4761 Label allocated;
4762
4763 Register rtop = LP64_ONLY(c_rarg3) NOT_LP64(rcx);
4764 Register rbot = LP64_ONLY(c_rarg2) NOT_LP64(rbx);
4765 Register rmon = LP64_ONLY(c_rarg1) NOT_LP64(rdx);
4766
4767 // initialize entry pointer
4768 __ xorl(rmon, rmon); // points to free slot or NULL
4769
4770 // find a free slot in the monitor block (result in rmon)
4771 {
4772 Label entry, loop, exit;
4773 __ movptr(rtop, monitor_block_top); // points to current entry,
4774 // starting with top-most entry
4775 __ lea(rbot, monitor_block_bot); // points to word before bottom
4776 // of monitor block
4777 __ jmpb(entry);
4778
4779 __ bind(loop);
4780 // check if current entry is used
4781 __ cmpptr(Address(rtop, BasicObjectLock::obj_offset_in_bytes()), (int32_t) NULL_WORD);
4782 // if not used then remember entry in rmon
4783 __ cmovptr(Assembler::equal, rmon, rtop); // cmov => cmovptr
4784 // check if current entry is for same object
4785 __ cmpptr(rax, Address(rtop, BasicObjectLock::obj_offset_in_bytes()));
4786 // if same object then stop searching
|
4747 // ...
4748 // [saved rbp ] <--- rbp
4749 void TemplateTable::monitorenter() {
4750 transition(atos, vtos);
4751
4752 // check for NULL object
4753 __ null_check(rax);
4754
4755 const Address monitor_block_top(
4756 rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
4757 const Address monitor_block_bot(
4758 rbp, frame::interpreter_frame_initial_sp_offset * wordSize);
4759 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
4760
4761 Label allocated;
4762
4763 Register rtop = LP64_ONLY(c_rarg3) NOT_LP64(rcx);
4764 Register rbot = LP64_ONLY(c_rarg2) NOT_LP64(rbx);
4765 Register rmon = LP64_ONLY(c_rarg1) NOT_LP64(rdx);
4766
4767 if (EnableValhalla) {
4768 Label is_not_value;
4769
4770 __ test_oop_is_not_value(rax, rmon, is_not_value);
4771 __ call_VM(noreg, CAST_FROM_FN_PTR(address,
4772 InterpreterRuntime::throw_illegal_monitor_state_exception));
4773 __ should_not_reach_here();
4774
4775 __ bind(is_not_value);
4776
4777 }
4778 // initialize entry pointer
4779 __ xorl(rmon, rmon); // points to free slot or NULL
4780
4781 // find a free slot in the monitor block (result in rmon)
4782 {
4783 Label entry, loop, exit;
4784 __ movptr(rtop, monitor_block_top); // points to current entry,
4785 // starting with top-most entry
4786 __ lea(rbot, monitor_block_bot); // points to word before bottom
4787 // of monitor block
4788 __ jmpb(entry);
4789
4790 __ bind(loop);
4791 // check if current entry is used
4792 __ cmpptr(Address(rtop, BasicObjectLock::obj_offset_in_bytes()), (int32_t) NULL_WORD);
4793 // if not used then remember entry in rmon
4794 __ cmovptr(Assembler::equal, rmon, rtop); // cmov => cmovptr
4795 // check if current entry is for same object
4796 __ cmpptr(rax, Address(rtop, BasicObjectLock::obj_offset_in_bytes()));
4797 // if same object then stop searching
|