Function mspace_realloc

libCacheSim/dataStructure/sparsepp/spp_dlalloc.h:3778–3822

}

SPP_API inline void* mspace_realloc(mspace msp, void* oldmem, size_t bytes)
{
    void* mem = 0;
    if (oldmem == 0)
        mem = mspace_malloc(msp, bytes);
    else if (bytes >= MAX_REQUEST)
        SPP_MALLOC_FAILURE_ACTION;
#ifdef REALLOC_ZERO_BYTES_FREES
    else if (bytes == 0)
        mspace_free(msp, oldmem);
#endif
    else
    {
        size_t nb = request2size(bytes);
        mchunkptr oldp = mem2chunk(oldmem);
#if ! SPP_FOOTERS
        mstate m = (mstate)msp;
#else
        mstate m = get_mstate_for(oldp);
        if (!m->ok_magic())
        {
            SPP_USAGE_ERROR_ACTION(m, oldmem);
            return 0;
        }
#endif
        if (1)
        {
            mchunkptr newp = m->try_realloc_chunk(oldp, nb, 1);
            if (newp != 0)
            {
                m->check_inuse_chunk(newp);
                mem = chunk2mem(newp);
            }
            else
            {
                mem = mspace_malloc(m, bytes);
                if (mem != 0)
                {
                    size_t oc = oldp->chunksize() - oldp->overhead_for();
                    memcpy(mem, oldmem, (oc < bytes) ? oc : bytes);
                    mspace_free(m, oldmem);
                }
            }
        }
    }
    return mem;
}