We adopt roughly the same approach as the C# Reflection API: a
GenericMethodDefinition is a method which has no method parameters
substituted, but lives in a open or closed type with some or all
type parameters substituted. To ensure the uniqueness of the MethodInfo,
we cache by the method type arguments, and also cache generated
DeclaredConstructors/DeclaredMethods in the TypeInfo.
This also enables MakeGenericMethod, albeit in a slightly different form
than the Reflection API: MakeGenericMethod lives in MethodBase, so it's
callable from a constructor (even though in C# constructors cannot be
generic). This slight violation of the spec reduces code duplication, so
it's probably worth it.
Finally, VirtualAddress gets set when populating GenericMethods, and so
it'll work whether or not the methods get cached/generated ahead of
time.
IsGenericMethodDefinition needs the same treatment as
IsGenericTypeDefinition, i.e. it should depend on whether the class is a
definition as opposed to merely checking if the type args are generic
parameters (which could happen in a partially specialized method).
Also, array/ref/pointer types of generic types are considered to have
generic parameters, so correct ContainsGenericParameters accordingly.
GenericMethods should contain all MethodSpec-referenced methods,
including those which are non-generic methods inside generic types. This
patch adds those methods, and also implements parameter substitution for
type arguments in parameters & return types.
We're aiming to make TypeInfo instances unique - no two TypeInfo
instances within a given model should refer to the same type. This will
allow us to use simple reference equality for comparing types.
The C# functions for GetGenericParameters/GetGenericArguments use
Type[], not lists, so we should conform to that.
Also fix the definition of IsGenericTypeDefinition - because it's
possible for a class to be instantiated with all generic parameters.
Replace the deeply nested ternaries in TypeInfo with if-statements for
clarity.
Remove in/out from CSharpName, keeping it only on immediate type params
in CSharpTypeDeclarationName (refactored to a method).
Rearrange name-related properties and methods to group them all together
into a region for easier navigation.
