Method CacheBlockMapping

FEXCore/Source/Interface/Core/LookupCache.h:263–297

private:
  void CacheBlockMapping(uint64_t Address, uintptr_t HostCode) {
    // Do L1
    auto& L1Entry = reinterpret_cast<LookupCacheEntry*>(L1Pointer)[Address & L1_ENTRIES_MASK];
    L1Entry.GuestCode = Address;
    L1Entry.HostCode = HostCode;

    // Do ful map
    auto FullAddress = Address;
    Address = Address & (VirtualMemSize - 1);

    uint64_t PageOffset = Address & (0x0FFF);
    Address >>= 12;
    uintptr_t* Pointers = reinterpret_cast<uintptr_t*>(PagePointer);
    uint64_t LocalPagePointer = Pointers[Address];
    if (!LocalPagePointer) {
      // We don't have a page pointer for this address
      // Allocate one now if we can
      uintptr_t NewPageBacking = AllocateBackingForPage();
      if (!NewPageBacking) {
        // Couldn't allocate, clear L2 and retry
        ClearL2Cache();
        CacheBlockMapping(Address, HostCode);
        return;
      }
      Pointers[Address] = NewPageBacking;
      LocalPagePointer = NewPageBacking;
    }

    // Add the new pointer to the page block
    auto BlockPointers = reinterpret_cast<LookupCacheEntry*>(LocalPagePointer);

    // This silently replaces existing mappings
    BlockPointers[PageOffset].GuestCode = FullAddress;
    BlockPointers[PageOffset].HostCode = HostCode;
  }

  uintptr_t AllocateBackingForPage() {
    uintptr_t NewBase = AllocateOffset;