In the C# reflection API, DeclaredNestedTypes on concrete generic types
just returns the nested types of the type definition. Notably, type
parameters are not substituted, because nested types are not guaranteed
to use the same containing type's type parameters.
Including *every* generated type in Types defeats the purpose of the
Types property, which is to list all types directly referred to by the
Il2Cpp metadata. Therefore, we return to the previous implementation:
only list types referred to by DefinitionIndex, ReferenceIndex, and
classIndexIndex.
Now that FromTypeReference uses public Make* methods instead of private
TypeInfo constructors, it doesn't need to be in TypeInfo anymore. Move
it back to Il2CppModel, where it was before.
With this patch, generic parameters in BaseType and method param/return
types are substituted correctly and deeply. Next up will be to apply the
same substitution rules to fields, properties, events, ...
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.
In order to select the correct generic type, model.GetGenericMethod is
changed to use Name (which includes generic parameters) instead of
BaseName. The tests for GenericMethodDefinitionInGenericClass* are also
changed to reflect the fact that the chosen methods are fully concrete.
TestGenerics now passes in its entirety.
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.
classIndexIndex only indexes the genericInstance, not the actual generic
instance type. Therefore, for example, A<Int32,Int32> and B<Int32,Int32>
have the same classIndexIndex because the generic parameters are the
same, despite being otherwise unrelated.
Instead of TypesByMethodSpecClassIndex, we simply call MakeGenericType
each time, relying on genericTypeInstances to dedup the resulting
instances. This patch thus also adds all of the types from
genericTypeInstances to the Il2CppModel.Types listing.
We use indices into the TypesByReferenceIndex table to defer type lookup
during model construction. However, this won't support fully generic
instances (which might not be in the type table at all). This patch
introduces a new TypeRef abstraction which can either represent a fixed
index or an instantiated generic type.
Also add MakeGenericType, which creates type instances from a generic
type definition and arguments. We will use this later to build properly
fleshed out concrete generic 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.
Because TypesByReferenceIndex can be populated in two places
(Il2CppModel constructor and GetTypeFromVirtualAddress), we need to
avoid generating the same type multiple times.
All types will need to eventually be fully generic. Therefore, we need
to eliminate indices when referring to types, and also be very lazy when
accessing TypeInfo properties so that we don't access uninitialized
types during model creation.
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.
This patch replaces Il2CppModel.resolveTypeReference by a static
TypeInfo constructor, and simultaneously refactors the TypeInfo
constructors to eliminate duplication between resolveTypeReference and
the original constructors. This will make future refactoring much
easier.
