Function tryAddModuleForPC

src/misc/alloc_tracker_fast_stack.cpp:200–227

Incremental add for late-loaded DLLs via GetModuleHandleExW — avoids full snapshot reinit. Concurrency: writers serialize through getCacheMutex(); readers in findModule() load g_modules[] without locking. The memmove below shifts existing entries in place, so a concurrent reader's binary search may briefly observe torn base/end/pdataLast values from an in-flight shift. Possible outcomes: 1. Mis-c

// LoadLibrary. Net effect at the diagnostic level is rare truncated frames,
// no crashes, which matches the trade-off in the upstream Gaijin source.
static bool tryAddModuleForPC(ULONG64 pc) noexcept {
    if (isNegCached(pc)) return false;
    HMODULE hMod = nullptr;
    if (!GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
                            (LPCWSTR)(uintptr_t)pc, &hMod) || !hMod) {
        addNegCache(pc);
        return false;
    }
    CachedModule newMod{};
    if (!parseModuleHeader(pc, (const BYTE*)hMod, newMod)) return false;

    std::lock_guard<std::mutex> lock(getCacheMutex());
    int count = g_moduleCount.load(std::memory_order_relaxed);
    if (count >= MAX_CACHED_MODULES) return false;
    // sorted insert
    int lo = 0, hi = count - 1, insertPos = count;
    while (lo <= hi) {
        int mid = (lo + hi) >> 1;
        if (newMod.base < g_modules[mid].base)      { insertPos = mid; hi = mid - 1; }
        else if (newMod.base > g_modules[mid].base) { lo = mid + 1; }
        else                                         { return true; } // already added by other thread
    }
    memmove(&g_modules[insertPos + 1], &g_modules[insertPos],
            (count - insertPos) * sizeof(CachedModule));
    g_modules[insertPos] = newMod;
    g_moduleCount.store(count + 1, std::memory_order_release);
    return true;
}

static __declspec(noinline) PRUNTIME_FUNCTION tryAddAndLookup(ULONG64 pc, const CachedModule *&lastMod,
                                                              ULONG64 &imageBase, int &pdataHint) noexcept {