src/hotspot/os_cpu/bsd_x86/os_bsd_x86.cpp

rev 52430 : 8213199: GC abstraction for Assembler::needs_explicit_null_check()

*** 578,588 ****
  #if defined(__APPLE__)
        // 32-bit Darwin reports a SIGBUS for nearly all memory access exceptions.
        // 64-bit Darwin may also use a SIGBUS (seen with compressed oops).
        // Catching SIGBUS here prevents the implicit SIGBUS NULL check below from
        // being called, so only do so if the implicit NULL check is not necessary.
!       } else if (sig == SIGBUS && MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
  #else
        } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) {
  #endif
          // BugId 4454115: A read from a MappedByteBuffer can fault
          // here if the underlying file has been truncated.
--- 578,588 ----
  #if defined(__APPLE__)
        // 32-bit Darwin reports a SIGBUS for nearly all memory access exceptions.
        // 64-bit Darwin may also use a SIGBUS (seen with compressed oops).
        // Catching SIGBUS here prevents the implicit SIGBUS NULL check below from
        // being called, so only do so if the implicit NULL check is not necessary.
!       } else if (sig == SIGBUS && !MacroAssembler::uses_implicit_null_check(info->si_addr)) {
  #else
        } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) {
  #endif
          // BugId 4454115: A read from a MappedByteBuffer can fault
          // here if the underlying file has been truncated.
*** 653,663 ****
            tty->print_cr("unknown opcode 0x%X with SIGFPE.", op);
            fatal("please update this code.");
          }
  #endif // AMD64
        } else if ((sig == SIGSEGV || sig == SIGBUS) &&
!                !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
            // Determination of interpreter/vtable stub/compiled code null exception
            stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
        }
      } else if (thread->thread_state() == _thread_in_vm &&
                 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */
--- 653,663 ----
            tty->print_cr("unknown opcode 0x%X with SIGFPE.", op);
            fatal("please update this code.");
          }
  #endif // AMD64
        } else if ((sig == SIGSEGV || sig == SIGBUS) &&
!                  MacroAssembler::uses_implicit_null_check(info->si_addr)) {
            // Determination of interpreter/vtable stub/compiled code null exception
            stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
        }
      } else if (thread->thread_state() == _thread_in_vm &&
                 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */