chizui/Il2CppInspectorRedux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

AppModel: Add GetVTableOffset(), GetVTableIndexFromClassOffset()

Browse Source
This commit is contained in:
Katy Coe
2020-08-13 07:59:15 +02:00
parent d1aafee184
commit 38bbe4830d
1 changed files with 22 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
Il2CppInspector.Common/Model/AppModel.cs
View File

@@ -7,7 +7,6 @@
using System; using System;
using System.Collections; using System.Collections;
using System.Collections.Generic; using System.Collections.Generic;
using System.Diagnostics;
using System.Linq; using System.Linq;
using Aron.Weiler; using Aron.Weiler;
using Il2CppInspector.Cpp; using Il2CppInspector.Cpp;
@@ -275,6 +274,8 @@ namespace Il2CppInspector.Model
// Get all the composite methods for a group // Get all the composite methods for a group
public IEnumerable<AppMethod> GetMethodGroup(string groupName) => Methods.Values.Where(m => m.Group == groupName); public IEnumerable<AppMethod> GetMethodGroup(string groupName) => Methods.Values.Where(m => m.Group == groupName);
// Static analysis tools
// Get the address map for the model // Get the address map for the model
// This takes a while to construct so we only build it if requested // This takes a while to construct so we only build it if requested
private AddressMap addressMap; private AddressMap addressMap;
@@ -283,5 +284,25 @@ namespace Il2CppInspector.Model
addressMap = new AddressMap(this); addressMap = new AddressMap(this);
return addressMap; return addressMap;
} }
// Get the byte offset in Il2CppClass for this app's Unity version to the vtable
public int GetVTableOffset() => CppTypeCollection.GetComplexType("Il2CppClass")["vtable"].OffsetBytes;
// Get the vtable method index from an offset from the start of the Il2CppClass
// Unity 5.3.0-5.3.5 uses MethodInfo** - a pointer to a list of MethodInfo pointers
// Unity 5.3.6-5.4.6 uses VirtualInvokeData* - a pointer to an array of VirtualInvokeData
// Unity 5.5.0 onwards moves the VirtualInvokeData to the end of Il2CppClass and makes it an array
// We only include support for Unity 5.5.0 onwards
public int GetVTableIndexFromClassOffset(int offset) {
if (UnityVersion.CompareTo("5.5.0") < 0)
throw new NotImplementedException("VTable index resolution is only supported for Unity 5.5.0 and later");
// VirtualInvokeData has two members. The first is the jump target.
// Il2CppMethodPointer methodPtr;
// const MethodInfo* method;
var offsetIntoVTable = offset - GetVTableOffset();
var vidSize = WordSize == 32? 8 : 16;
return offsetIntoVTable / vidSize;
}
} }
} }