The profiler receives a method but does not receive a FunctionEnter callback for the same method

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This article was previously published under Q310828

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SYMPTOMS

There may be times when the profiler receives a just-in-time (JIT) compilation event for a method but does not receive a FunctionEnter callback for the same method.

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This scenario can arise when a method is executed from a context-bound object. Common Language Runtime (CLR) Remoting currently does not recognize that the method could be executed in a difference context. So the method is always JIT-complied for the current context as well as for the remoting contexts. The JIT-complied method for the current context may never be entered. As a result, the FunctionEnter callback will not be called.

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STATUS

This behavior is by design.

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MORE INFORMATION

The following pseudocode may help illustrate this problem.

FAgeCalc::getFactorialAge
{
  for(int i=0 i< 3; i++)
  {
      <create_domain and unwrap an object obj>
      obj::get_iiAge();
      <unload domain>
  }
}

The profiler receives the following notifications:

TID: 0x0013fbe0 JITTED: Method: FAgeCalc.FAgeCalc::get_iiAge(0x0eba57c8)

NOTE: This method was never entered.

TID: 0x0013fbe0 JITTED: Method: AgeCalc.FAgeCalc::get_iiAge(0x15d76dc0)
TID: 0x0013fbe0 Entered: Method: FAgeCalc.FAgeCalc::get_iiAge(0x15d76dc0)

TID: 0x0013fbe0 JITTED: Method: FAgeCalc.FAgeCalc::get_iiAge(0x102a6d70)
TID: 0x0013fbe0 Entered: Method: FAgeCalc.FAgeCalc::get_iiAge(0x102a6d70)

TID: 0x0013fbe0 JITTED: Method: FAgeCalc.FAgeCalc::get_iiAge(0x102a6d70)
TID: 0x0013fbe0 Entered: Method: FAgeCalc.FAgeCalc::get_iiAge(0x102a6d70)

It makes sense that you receive multiple JIT-compilation events and FunctionEnter events for each appdomain because the object is context-bound. However, the first JIT-compilation event is corresponding to the method JIT-complied for the context in the default domain. Because the method is never executed in the default domain, it is never entered, and the profiler does not receive a FunctionEnter callback.

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