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Unity 2022.3.10 offsets and/or changes #20

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@nalka0 nalka0 commented Dec 25, 2023

This PR contains all the changes I made to make unity spy work on a game using Unity 2022.3.10.

I'm unsure how to create a complete new offset object and would need help with it (I commented the offsets I had to replace with the values I figured out).

There are also some non-offset changes, these probably need some work/testing to make them compatible with all other supported unity versions.

@nalka0 nalka0 marked this pull request as draft December 25, 2023 21:38
@sebastientromp
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sebastientromp commented Jan 14, 2024

So the first step to define a new version is to add a new public static readonly MonoLibraryOffsets declaration in MonoLibraryOffsets.cs. By convention, the variable name has the version name, as well as whether it's for a 32- or 64-bits game.
Then you need to fill out all the new offsets. Some of them might have stayed the same, but you'll still have to provide a value for all of them.

Once this is done, you can add it to the List<MonoLibraryOffsets> SupportedVersions in MonoLibraryOffsets.cs.

Normally, these are the only places you should need to modify. If there are other pieces of the code that don't work with that new version, we'll need to investigate more thoroughly.
Edit: Also add the new version to the UnityVersions class like you did

@@ -81,16 +81,16 @@ public TypeDefinition GetTypeDefinition(IntPtr address)
{
var definitions = new ConcurrentDictionary<IntPtr, TypeDefinition>();
int classCache = this.Process.MonoLibraryOffsets.ImageClassCache;
var classCacheSize = this.ReadUInt32(classCache + this.Process.MonoLibraryOffsets.HashTableSize);
var classCacheTableArray = this.ReadPtr(classCache + this.Process.MonoLibraryOffsets.HashTableTable);
var classCacheSize = this.ReadUInt32(/*classCache + this.Process.MonoLibraryOffsets.HashTableSize*/1256);
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Here I only know the good values for classeCache + HashTableSize and classCache + HashTableTable but I have no idea about the individual values of each offset

@@ -65,6 +65,7 @@ public TypeDefinition([NotNull] AssemblyImage image, IntPtr address)
// Get the generic type arguments
if (this.TypeInfo.TypeCode == TypeCode.GENERICINST)
{
this.fieldCount = this.ReadInt32(96);
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Here I can't simply use 96 for the TypeDefinitionFieldCount offset since this line isn't always executed at the same time as the line that uses TypeDefinitionFieldCount

@@ -193,7 +194,7 @@ private IReadOnlyList<FieldDefinition> GetFields()
}

var fields = new List<FieldDefinition>();
if (this.ClassKind == MonoClassKind.GInst)
if (this.ClassKind is MonoClassKind.GInst or MonoClassKind.GParam)
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This isn't simply an offset change

@@ -248,13 +249,15 @@ private IEnumerable<TypeDefinition> NestedHierarchy()

private TypeDefinition GetGeneric()
{
if (this.ClassKind != MonoClassKind.GInst)
if (this.ClassKind is MonoClassKind.GInst or MonoClassKind.GParam)
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This isn't simply an offset change

@@ -308,8 +308,7 @@ private int GetSize(TypeCode typeCode)

case TypeCode.U:
case TypeCode.U4:
return sizeof(uint);

return 8;
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This doesn't seem to be bound to offsets

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2 participants