Function demangleFunc

include/fastgrind.h:3255–3297

#if defined(FASTGRIND_INSTRUMENT)
MEM_NO_INSTRUMENT static const char *demangleFunc(const char *mangled)
{
    if (!mangled)
        return mangled;

    struct protect
    {
        ~protect()
        {
            cache.clear();
        }
        std::unordered_map<const char *, const char *> cache;
        std::mutex lk;
    };

    static protect p;
    {
        std::lock_guard<std::mutex> g(p.lk);
        auto it = p.cache.find(mangled);
        if (it != p.cache.end())
            return it->second;
    }

    int status = 0;
    char *tmp = abi::__cxa_demangle(mangled, nullptr, nullptr, &status);
    const char *ret = nullptr;

    if (status == 0 && tmp)
    {
        ret = strdup(tmp);
        free(tmp);
    }
    else
    {
        ret = mangled;
    }

    {
        std::lock_guard<std::mutex> g(p.lk);
        p.cache[mangled] = ret;
    }
    return ret;
}

MEM_NO_INSTRUMENT static const char *tryAddr2lineResolve(void *addr)
{