From f715586b3b184cb28ff3df2dae117f71e4dfdd15 Mon Sep 17 00:00:00 2001
From: Katy Coe <djkaty@start.no>
Date: Sun, 2 Feb 2020 06:45:52 +0100
Subject: [PATCH] IL2CPP: Process Il2CppGenericMethodFunctionsDefinitions and
 Il2CppGenericMethodIndices

---
 Il2CppInspector/IL2CPP/Il2CppBinary.cs        | 13 ++++++++++++-
 Il2CppInspector/IL2CPP/Il2CppBinaryClasses.cs | 14 +++++++++++++-
 Il2CppInspector/IL2CPP/Il2CppInspector.cs     |  1 +
 3 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/Il2CppInspector/IL2CPP/Il2CppBinary.cs b/Il2CppInspector/IL2CPP/Il2CppBinary.cs
index c894515..368768c 100644
--- a/Il2CppInspector/IL2CPP/Il2CppBinary.cs
+++ b/Il2CppInspector/IL2CPP/Il2CppBinary.cs
@@ -1,6 +1,6 @@
 /*
     Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
-    Copyright 2017-2019 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
+    Copyright 2017-2020 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
 
     All rights reserved.
 */
@@ -46,6 +46,9 @@ namespace Il2CppInspector
         // List of run-time concrete generic class and method signatures
         public List<Il2CppGenericInst> GenericInstances { get; private set; }
 
+        // List of constructed generic method function pointers corresponding to each possible method instantiation
+        public Dictionary<Il2CppMethodSpec, ulong> GenericMethodPointers { get; } = new Dictionary<Il2CppMethodSpec, ulong>();
+
         // Every defined type
         public List<Il2CppType> TypeReferences { get; private set; }
 
@@ -200,6 +203,14 @@ namespace Il2CppInspector
 
             // Concrete generic class and method signatures
             GenericInstances = image.ReadMappedObjectPointerArray<Il2CppGenericInst>(MetadataRegistration.genericInsts, (int) MetadataRegistration.genericInstsCount);
+
+            // Concrete generic method pointers
+            // TODO: Invoker pointers in tableEntry.indices.invokerIndex
+            var genericMethodPointers = image.ReadMappedArray<ulong>(CodeRegistration.genericMethodPointers, (int) CodeRegistration.genericMethodPointersCount);
+            var genericMethodTable = image.ReadMappedArray<Il2CppGenericMethodFunctionsDefinitions>(MetadataRegistration.genericMethodTable, (int) MetadataRegistration.genericMethodTableCount);
+            foreach (var tableEntry in genericMethodTable) {
+                GenericMethodPointers.Add(MethodSpecs[tableEntry.genericMethodIndex], genericMethodPointers[tableEntry.indices.methodIndex]);
+            }
         }
     }
 }
diff --git a/Il2CppInspector/IL2CPP/Il2CppBinaryClasses.cs b/Il2CppInspector/IL2CPP/Il2CppBinaryClasses.cs
index c59b658..6c8fea3 100644
--- a/Il2CppInspector/IL2CPP/Il2CppBinaryClasses.cs
+++ b/Il2CppInspector/IL2CPP/Il2CppBinaryClasses.cs
@@ -1,6 +1,6 @@
 /*
     Copyright 2017 Perfare - https://github.com/Perfare/Il2CppDumper
-    Copyright 2017-2019 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
+    Copyright 2017-2020 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
 
     All rights reserved.
 */
@@ -216,4 +216,16 @@ namespace Il2CppInspector
         public int classIndexIndex;
         public int methodIndexIndex;
     }
+
+    public class Il2CppGenericMethodFunctionsDefinitions
+    {
+        public int genericMethodIndex;
+        public Il2CppGenericMethodIndices indices;
+    }
+
+    public class Il2CppGenericMethodIndices
+    {
+        public int methodIndex;
+        public int invokerIndex;
+    }
 }
diff --git a/Il2CppInspector/IL2CPP/Il2CppInspector.cs b/Il2CppInspector/IL2CPP/Il2CppInspector.cs
index 70f8f38..49d70ab 100644
--- a/Il2CppInspector/IL2CPP/Il2CppInspector.cs
+++ b/Il2CppInspector/IL2CPP/Il2CppInspector.cs
@@ -60,6 +60,7 @@ namespace Il2CppInspector
         public Dictionary<string, Il2CppCodeGenModule> Modules => Binary.Modules;
         public ulong[] CustomAttributeGenerators => Binary.CustomAttributeGenerators;
         public Il2CppMethodSpec[] MethodSpecs => Binary.MethodSpecs;
+        public Dictionary<Il2CppMethodSpec, ulong> GenericMethodPointers => Binary.GenericMethodPointers;
 
         // TODO: Finish all file access in the constructor and eliminate the need for this
         public IFileFormatReader BinaryImage => Binary.Image;