src/hotspot/share/oops/method.cpp

rev 47400 : [mq]: cmpxchg_ptr
rev 47401 : [mq]: cmpxchg_if_null
rev 47404 : [mq]: load_ptr_acquire

*** 442,451 ****
--- 442,456 ----
    }
  
    return mh->method_counters();
  }
  
+ bool Method::init_method_counters(MethodCounters* counters) {
+   // Try to install a pointer to MethodCounters, return true on success.
+   return Atomic::cmpxchg_if_null(counters, &_method_counters);
+ }
+ 
  void Method::cleanup_inline_caches() {
    // The current system doesn't use inline caches in the interpreter
    // => nothing to do (keep this method around for future use)
  }
  
*** 1107,1117 ****
      link_method(mh, CHECK);
    }
  }
  
  volatile address Method::from_compiled_entry_no_trampoline() const {
!   nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
    if (code) {
      return code->verified_entry_point();
    } else {
      return adapter()->get_c2i_entry();
    }
--- 1112,1122 ----
      link_method(mh, CHECK);
    }
  }
  
  volatile address Method::from_compiled_entry_no_trampoline() const {
!   CompiledMethod *code = OrderAccess::load_acquire(&_code);
    if (code) {
      return code->verified_entry_point();
    } else {
      return adapter()->get_c2i_entry();
    }
*** 1133,1143 ****
  // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
  // (could be racing a deopt).
  // Not inline to avoid circular ref.
  bool Method::check_code() const {
    // cached in a register or local.  There's a race on the value of the field.
!   CompiledMethod *code = (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code);
    return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
  }
  
  // Install compiled code.  Instantly it can execute.
  void Method::set_code(const methodHandle& mh, CompiledMethod *code) {
--- 1138,1148 ----
  // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
  // (could be racing a deopt).
  // Not inline to avoid circular ref.
  bool Method::check_code() const {
    // cached in a register or local.  There's a race on the value of the field.
!   CompiledMethod *code = OrderAccess::load_acquire(&_code);
    return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method());
  }
  
  // Install compiled code.  Instantly it can execute.
  void Method::set_code(const methodHandle& mh, CompiledMethod *code) {