Add some additional methods for working with concrete generics (#485)

Author: ds5678

Cpp2IL.Core/Model/Contexts/ConcreteGenericFieldAnalysisContext.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using System.Reflection;
 using Cpp2IL.Core.Utils;
 
@@ -22,4 +23,9 @@ public ConcreteGenericFieldAnalysisContext(FieldAnalysisContext baseField, Gener
         BaseFieldContext = baseField;
         DefaultFieldType = GenericInstantiation.Instantiate(baseField.FieldType, genericInstanceType.GenericArguments, []);
     }
+
+    public ConcreteGenericFieldAnalysisContext(FieldAnalysisContext baseField, IEnumerable<TypeAnalysisContext> typeGenericParameters)
+        : this(baseField, baseField.DeclaringType.MakeGenericInstanceType(typeGenericParameters))
+    {
+    }
 }

Cpp2IL.Core/Model/Contexts/FieldAnalysisContext.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Collections.Generic;
 using System.Reflection;
 using Cpp2IL.Core.Utils;
 using LibCpp2IL.BinaryStructures;
@@ -80,6 +82,18 @@ public FieldAnalysisContext(Il2CppFieldReflectionData? backingData, TypeAnalysis
             InitCustomAttributeData();
     }
 
+    public ConcreteGenericFieldAnalysisContext MakeConcreteGenericField(params IEnumerable<TypeAnalysisContext> typeGenericParameters)
+    {
+        if (this is ConcreteGenericFieldAnalysisContext)
+        {
+            throw new InvalidOperationException($"Attempted to make a {nameof(ConcreteGenericFieldAnalysisContext)} concrete: {this}");
+        }
+        else
+        {
+            return new ConcreteGenericFieldAnalysisContext(this, typeGenericParameters);
+        }
+    }
+
     public override string ToString() => $"Field: {DeclaringType.Definition?.Name}::{BackingData?.Field.Name}";
 
     #region StableNameDotNet

Cpp2IL.Core/Model/Contexts/MethodAnalysisContext.cs

@@ -310,6 +310,18 @@ public ConcreteGenericMethodAnalysisContext MakeGenericInstanceMethod(params IEn
         }
     }
 
+    public ConcreteGenericMethodAnalysisContext MakeConcreteGenericMethod(IEnumerable<TypeAnalysisContext> typeGenericParameters, IEnumerable<TypeAnalysisContext> methodGenericParameters)
+    {
+        if (this is ConcreteGenericMethodAnalysisContext)
+        {
+            throw new InvalidOperationException($"Attempted to make a {nameof(ConcreteGenericMethodAnalysisContext)} concrete: {this}");
+        }
+        else
+        {
+            return new ConcreteGenericMethodAnalysisContext(this, typeGenericParameters, methodGenericParameters);
+        }
+    }
+
     public override string ToString() => $"Method: {FullName}";
 
     #region StableNameDot implementation

Cpp2IL.Core/Model/Contexts/TypeAnalysisContext.cs

@@ -242,7 +242,7 @@ public ByRefTypeAnalysisContext MakeByReferenceType()
         return new(this, DeclaringAssembly);
     }
 
-    public GenericInstanceTypeAnalysisContext MakeGenericInstanceType(IEnumerable<TypeAnalysisContext> genericArguments)
+    public GenericInstanceTypeAnalysisContext MakeGenericInstanceType(params IEnumerable<TypeAnalysisContext> genericArguments)
     {
         return new(this, genericArguments, DeclaringAssembly);
     }