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Attach IL2CPP games through the nearest measured build #160

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Merged
CryZe merged 3 commits into from
Sep 18, 2026
Merged

Attach IL2CPP games through the nearest measured build #160

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0b02b42
replace version fallback with nearest build
ero-qt Sep 14, 2026
3d7dc9d
remove il2cpp version tables
ero-qt Sep 14, 2026
ef0f1b1
expose measured il2cpp profiles
CryZe Sep 18, 2026
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465 changes: 186 additions & 279 deletions src/game_engine/unity/il2cpp/builds.rs
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57 changes: 24 additions & 33 deletions src/game_engine/unity/il2cpp/collections_tests.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,14 +4,15 @@
//! is the route every corlib dictionary takes.

use super::super::managed::DictionaryShape;
use super::{IL2CPPOffsets, Module, Version};
use super::Module;
use crate::runtime::mock::with_process;
use crate::{Address, PointerSize, Process};

use std::vec;
use std::vec::Vec;

const BASE: u64 = 0x60_0000;
const MEASURED_2019: (u16, u16, u16, u16) = (2019, 4, 41, 9172);

fn put(image: &mut [u8], at: u64, bytes: &[u8]) {
let at = at as usize;
Expand All @@ -32,11 +33,12 @@ fn field(image: &mut [u8], at: u64, name: u64, type_: u64, offset: i32) {
put(image, at + 0x18, &offset.to_le_bytes());
}

fn image(version: Version) -> Vec<u8> {
let field_count_at = match version {
Version::V2019 => 0x11C,
_ => 0x124,
};
fn image(unity: (u16, u16, u16, u16)) -> Vec<u8> {
let field_count_at = super::builds::nearest(unity, PointerSize::Bit64)
.unwrap()
.profile
.class
.field_count as u64;
let mut i = vec![0; 0x3000];

let strings = [
Expand Down Expand Up @@ -198,25 +200,26 @@ fn image(version: Version) -> Vec<u8> {
i
}

fn module(version: Version) -> Module {
fn module(unity: (u16, u16, u16, u16)) -> Module {
Module {
assemblies: Address::new(BASE),
type_info_definition_table: Address::new(BASE + 0x40),
version,
offsets: IL2CPPOffsets::new(version, PointerSize::Bit64).unwrap(),
profile: super::builds::nearest(unity, PointerSize::Bit64)
.unwrap()
.profile,
pointer_size: PointerSize::Bit64,
}
}

fn on_fixture(version: Version, test: impl FnOnce(&Process, &Module)) {
with_process(&[(BASE, &image(version))], |process| {
test(process, &module(version));
fn on_fixture(unity: (u16, u16, u16, u16), test: impl FnOnce(&Process, &Module)) {
with_process(&[(BASE, &image(unity))], |process| {
test(process, &module(unity));
});
}

#[test]
fn dictionaries_resolve_through_the_cached_class() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
let offsets = module
.get_dictionary_offsets(process, Address::new(BASE))
.unwrap();
Expand All @@ -240,12 +243,9 @@ fn dictionaries_resolve_through_the_cached_class() {
});
}

// The 2022.2-and-later fallback table carries no cached class, because the
// measured builds inside that stretch disagree. A fallback attach misses
// cleanly; known builds carry their own value.
#[test]
fn dictionaries_read_their_live_pairs() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
let slot = Address::new(BASE);
let offsets = module.get_dictionary_offsets(process, slot).unwrap();
let pairs = module
Expand All @@ -257,7 +257,7 @@ fn dictionaries_read_their_live_pairs() {

#[test]
fn dictionaries_derived_from_corlibs_dictionary_resolve() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
let slot = Address::new(BASE + 0x8);
let offsets = module.get_dictionary_offsets(process, slot).unwrap();
let pairs = module
Expand All @@ -269,7 +269,7 @@ fn dictionaries_derived_from_corlibs_dictionary_resolve() {

#[test]
fn dictionary_shaped_objects_are_not_dictionaries() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
assert!(module
.get_dictionary_offsets(process, Address::new(BASE + 0x10))
.is_none());
Expand All @@ -278,7 +278,7 @@ fn dictionary_shaped_objects_are_not_dictionaries() {

#[test]
fn dictionaries_without_allocated_backing_read_empty() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
let slot = Address::new(BASE + 0x18);
let offsets = module.get_dictionary_offsets(process, slot).unwrap();
let pairs = module
Expand All @@ -290,7 +290,7 @@ fn dictionaries_without_allocated_backing_read_empty() {

#[test]
fn hash_sets_read_their_live_values() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
let slot = Address::new(BASE + 0x20);
let offsets = module.get_hash_set_offsets(process, slot).unwrap();
let values = module
Expand All @@ -302,7 +302,7 @@ fn hash_sets_read_their_live_values() {

#[test]
fn hash_sets_derived_from_corlibs_hash_set_resolve() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
let slot = Address::new(BASE + 0x28);
let offsets = module.get_hash_set_offsets(process, slot).unwrap();
let values = module
Expand All @@ -314,7 +314,7 @@ fn hash_sets_derived_from_corlibs_hash_set_resolve() {

#[test]
fn hash_set_shaped_objects_are_not_hash_sets() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
assert!(module
.get_hash_set_offsets(process, Address::new(BASE + 0x30))
.is_none());
Expand All @@ -323,7 +323,7 @@ fn hash_set_shaped_objects_are_not_hash_sets() {

#[test]
fn hash_sets_without_allocated_backing_read_empty() {
on_fixture(Version::V2019, |process, module| {
on_fixture(MEASURED_2019, |process, module| {
let slot = Address::new(BASE + 0x38);
let offsets = module.get_hash_set_offsets(process, slot).unwrap();
let values = module
Expand All @@ -332,12 +332,3 @@ fn hash_sets_without_allocated_backing_read_empty() {
assert!(values.is_empty());
});
}

#[test]
fn fallback_tables_without_a_cached_class_answer_nothing() {
on_fixture(Version::V2022, |process, module| {
assert!(module
.get_dictionary_offsets(process, Address::new(BASE))
.is_none());
});
}
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