Function realloc

engine/dlib/src/dlib/memprofile.cpp:556–612

extern "C"
DM_DLLEXPORT void *realloc(void* ptr, size_t size)
{
    // This simplifies the code below a bit
    if (ptr == 0)
        return malloc(size);

    if (!reallocp)
    {
        CreateHooks();
    }

    size_t old_usable_size = 0;
#if defined(__linux__)
    old_usable_size = malloc_usable_size(ptr);
#elif defined(__MACH__)
    old_usable_size = malloc_size(ptr);
#else
#error "Unsupported platform"
#endif

    void* old_ptr = ptr;
    ptr = reallocp(ptr, size);
    if (ptr)
    {
        size_t usable_size = 0;
#if defined(__linux__)
        usable_size = malloc_usable_size(ptr);
#elif defined(__MACH__)
        usable_size = malloc_size(ptr);
#else
#error "Unsupported platform"
#endif

        dmMemProfile::DumpBacktrace('F', old_ptr, old_usable_size);
        dmMemProfile::DumpBacktrace('M', ptr, usable_size);

        if (dmMemProfile::g_ExtStats)
        {
            dmAtomicSub32(&dmMemProfile::g_ExtStats->m_TotalActive, (uint32_t) old_usable_size);

            dmAtomicAdd32(&dmMemProfile::g_ExtStats->m_TotalAllocated, (uint32_t) usable_size);
            dmAtomicAdd32(&dmMemProfile::g_ExtStats->m_TotalActive, (uint32_t) usable_size);
            dmAtomicAdd32(&dmMemProfile::g_ExtStats->m_AllocationCount, 1U);

            if (dmMemProfile::m_PropertyAddU32)
            {
                dmMemProfile::m_PropertyAddU32(dmMemProfile::g_ProfileAllocations, 1U);
                dmMemProfile::m_PropertyAddU32(dmMemProfile::g_ProfileAmount, usable_size);
            }
        }
    }
    else
    {
        // Nothing happended
    }
    return ptr;
}