Deep Dive: .NET InternalCall Mechanics

.NET Internals: InternalCall Visualizer

CoreCLR

C# / Managed

// In System.Private.CoreLib.dll
namespace System {
  public class Object {

    [MethodImpl(MethodImplOptions.InternalCall)]
    public extern int GetHashCode();
  }
}

JIT Compiler

Resolving Method Token 0x060002

Flag	Action	Target
IsIL	Compile MSIL	Native Code Block
IsInternalCall	Lookup ECall Table	ObjectNative::GetHashCode
IsPInvoke	Load Library	kernel32.dll

MANAGED

GC Mode: Cooperative

UNMANAGED (C++)

GC Mode: Preemptive

C++ / CoreCLR

// src/vm/object.cpp
FCIMPL1(INT32, ObjectNative::GetHashCode, Object* obj)
{
  // Access raw object header in heap
  if (obj == NULL) return 0;
  DWORD idx = obj->GetHeader()->GetSyncBlockIndex();
  return (INT32)idx;
}
FCIMPLEND

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