/// <summary>
/// Gets a value indicating whether GC transition should be suppressed on the given p/invoke.
/// </summary>
public static bool IsSuppressGCTransition(this MethodDesc method)
{
Debug.Assert(method.IsPInvoke);
// Check SuppressGCTransition attribute
if (method.HasSuppressGCTransitionAttribute())
{
return(true);
}
MethodSignatureFlags unmanagedCallConv = method.GetPInvokeMethodMetadata().Flags.UnmanagedCallingConvention;
if (unmanagedCallConv != MethodSignatureFlags.None)
{
return(false);
}
if (!(method is Internal.TypeSystem.Ecma.EcmaMethod ecmaMethod))
{
return(false);
}
// Check UnmanagedCallConv attribute
System.Reflection.Metadata.CustomAttributeValue <TypeDesc>?unmanagedCallConvAttribute = ecmaMethod.GetDecodedCustomAttribute("System.Runtime.InteropServices", "UnmanagedCallConvAttribute");
if (unmanagedCallConvAttribute == null)
{
return(false);
}
foreach (DefType defType in unmanagedCallConvAttribute.Value.EnumerateCallConvsFromAttribute())
{
if (defType.Name == "CallConvSuppressGCTransition")
{
return(true);
}
}
return(false);
}