/// <summary>
/// For a shared (canonical) instance method on a generic valuetype, gets a method that can be used to call the
/// method given a boxed version of the generic valuetype as 'this' pointer.
/// </summary>
public MethodDesc GetSpecialUnboxingThunk(MethodDesc targetMethod, ModuleDesc ownerModuleOfThunk)
{
Debug.Assert(targetMethod.IsSharedByGenericInstantiations);
Debug.Assert(!targetMethod.Signature.IsStatic);
Debug.Assert(!targetMethod.HasInstantiation);
TypeDesc owningType = targetMethod.OwningType;
Debug.Assert(owningType.IsValueType);
var owningTypeDefinition = (MetadataType)owningType.GetTypeDefinition();
// Get a reference type that has the same layout as the boxed valuetype.
var typeKey = new BoxedValuetypeHashtableKey(owningTypeDefinition, ownerModuleOfThunk);
BoxedValueType boxedTypeDefinition = _boxedValuetypeHashtable.GetOrCreateValue(typeKey);
// Get a method on the reference type with the same signature as the target method (but different
// calling convention, since 'this' will be a reference type).
var targetMethodDefinition = targetMethod.GetTypicalMethodDefinition();
var methodKey = new UnboxingThunkHashtableKey(targetMethodDefinition, boxedTypeDefinition);
GenericUnboxingThunk thunkDefinition = _unboxingThunkHashtable.GetOrCreateValue(methodKey);
// Find the thunk on the instantiated version of the reference type.
Debug.Assert(owningType != owningTypeDefinition);
InstantiatedType boxedType = boxedTypeDefinition.MakeInstantiatedType(owningType.Instantiation);
MethodDesc thunk = GetMethodForInstantiatedType(thunkDefinition, boxedType);
Debug.Assert(!thunk.HasInstantiation);
return(thunk);
}
public MethodDesc GetUnboxingThunk(MethodDesc targetMethod, ModuleDesc ownerModuleOfThunk)
{
TypeDesc owningType = targetMethod.OwningType;
Debug.Assert(owningType.IsValueType);
var owningTypeDefinition = (MetadataType)owningType.GetTypeDefinition();
// Get a reference type that has the same layout as the boxed valuetype.
var typeKey = new BoxedValuetypeHashtableKey(owningTypeDefinition, ownerModuleOfThunk);
BoxedValueType boxedTypeDefinition = _boxedValuetypeHashtable.GetOrCreateValue(typeKey);
// Get a method on the reference type with the same signature as the target method (but different
// calling convention, since 'this' will be a reference type).
var targetMethodDefinition = targetMethod.GetTypicalMethodDefinition();
var methodKey = new UnboxingThunkHashtableKey(targetMethodDefinition, boxedTypeDefinition);
UnboxingThunk thunkDefinition = _nonGenericUnboxingThunkHashtable.GetOrCreateValue(methodKey);
// Find the thunk on the instantiated version of the reference type.
if (owningType != owningTypeDefinition)
{
InstantiatedType boxedType = boxedTypeDefinition.MakeInstantiatedType(owningType.Instantiation);
MethodDesc thunk = GetMethodForInstantiatedType(thunkDefinition, boxedType);
//TODO: this might be triggered by a struct that implements an interface with a generic method
Debug.Assert(!thunk.HasInstantiation);
return(thunk);
}
else
{
//TODO: this might be triggered by a struct that implements an interface with a generic method
Debug.Assert(!thunkDefinition.HasInstantiation);
return(thunkDefinition);
}
}