Assign to "sample.state" before reading it.

src/platform-macos.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 530 matching lines @@
   mach_port_t task_self_;
   thread_act_t profiled_thread_;
   pthread_t sampler_thread_;
 
   // Sampler thread handler.
   void Runner() {
     // Loop until the sampler is disengaged.
     while (sampler_->IsActive()) {
       TickSample sample;
 
+      // We always sample the VM state.
+      sample.state = Logger::state();
+
       // If profiling, we record the pc and sp of the profiled thread.
       if (sampler_->IsProfiling()
           && KERN_SUCCESS == thread_suspend(profiled_thread_)) {
 #if V8_HOST_ARCH_X64
         thread_state_flavor_t flavor = x86_THREAD_STATE64;
         x86_thread_state64_t state;
         mach_msg_type_number_t count = x86_THREAD_STATE64_COUNT;
 #if __DARWIN_UNIX03
 #define REGISTER_FIELD(name) __r ## name
 #else
@@ skipping 17 matching lines @@
                              reinterpret_cast<natural_t*>(&state),
                              &count) == KERN_SUCCESS) {
           sample.pc = reinterpret_cast<Address>(state.REGISTER_FIELD(ip));
           sample.sp = reinterpret_cast<Address>(state.REGISTER_FIELD(sp));
           sample.fp = reinterpret_cast<Address>(state.REGISTER_FIELD(bp));
           sampler_->SampleStack(&sample);
         }
         thread_resume(profiled_thread_);
       }
 
-      // We always sample the VM state.
-      sample.state = Logger::state();
       // Invoke tick handler with program counter and stack pointer.
       sampler_->Tick(&sample);
 
       // Wait until next sampling.
       usleep(sampler_->interval_ * 1000);
     }
   }
 };
 
 #undef REGISTER_FIELD
@@ skipping 52 matching lines @@
 
   // Deallocate Mach port for thread.
   if (IsProfiling()) {
     mach_port_deallocate(data_->task_self_, data_->profiled_thread_);
   }
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal