Orig-copy transpiler

/*
Orig copy approach. Uses the fact that the installation already protects a (sufficiently large enough) region of memory for any inserted instructions. Not always guaranteed, but will almost always work.
This is if you don't want to do one of the other options, or if the heap is always mapped as -X (which it might be).
*/

MAKE_HOOK_OFFSETLESS(LateUpdate, void, void *self) {
    // We actually modified orig, so we just call it here.
    // You could do something similar to the first approach (allocate a temporary array) and call that instead if you prefer
    LateUpdate(self);
}

extern "C" void load() {
    auto lateUpdateInfo = il2cpp_utils::FindMethodUnsafe("", "BeatmapObjectCallbackController", "LateUpdate", 0);
    auto nextMethodInfo = il2cpp_utils::FindMethodUnsafe("", "BeatmapObjectCallbackController", "AddBeatmapObjectCallback", 2);
    uint32_t *startAddr = (uint32_t *) lateUpdateInfo->methodPointer;
    uint32_t *endAddr = (uint32_t *) nextMethodInfo->methodPointer;

    INSTALL_HOOK_OFFSETLESS(LateUpdate, il2cpp_utils::FindMethodUnsafe("", "BeatmapObjectCallbackController", "LateUpdate", 0));
    // Copy instructions from trampoline
    std::vector<uint32_t> instructions(reinterpret_cast<uint32_t*>(LateUpdate), reinterpret_cast<uint32_t*>(
        reinterpret_cast<std::size_t>(LateUpdate) + (endAddr - startAddr)
    ));

    int dstIdx = -1;
    for (int i = 0; i < instructions.size(); i++) {
        uint32_t ins = instructions[i];
        if (ins == 0x1e293901) { // 0x0139291e fsub s1,s8,s9
            dstIdx = i;
            // Insert instructions, can insert at index i, since insts is copied
            // This will replace the fsub instruction (can skip if you add 1 to dstIdx first)
            reinterpret_cast<uint32_t*>(LateUpdate)[dstIdx] = 0x0;
            ++dstIdx;
        }
        if (dstIdx >= 0) {
            // Only overwrite orig when necessary
            // (Can save some code if you use a local)
            reinterpret_cast<uint32_t*>(LateUpdate)[dstIdx] = ins;
            ++dstIdx;
        }
    }
}