Method GetPruneRange

src/validation.cpp:6366–6392

}

std::pair<int, int> Chainstate::GetPruneRange(int last_height_can_prune) const
{
    if (m_chain.Height() <= 0) {
        return {0, 0};
    }
    int prune_start{0};

    if (m_from_snapshot_blockhash && m_assumeutxo != Assumeutxo::VALIDATED) {
        // Only prune blocks _after_ the snapshot if this is a snapshot chain
        // that has not been fully validated yet. The earlier blocks need to be
        // kept to validate the snapshot
        prune_start = Assert(SnapshotBase())->nHeight + 1;
    }

    int max_prune = std::max<int>(
        0, m_chain.Height() - static_cast<int>(MIN_BLOCKS_TO_KEEP));

    // last block to prune is the lesser of (caller-specified height, MIN_BLOCKS_TO_KEEP from the tip)
    //
    // While you might be tempted to prune the background chainstate more
    // aggressively (i.e. fewer MIN_BLOCKS_TO_KEEP), this won't work with index
    // building - specifically blockfilterindex requires undo data, and if
    // we don't maintain this trailing window, we hit indexing failures.
    int prune_end = std::min(last_height_can_prune, max_prune);

    return {prune_start, prune_end};
}

std::optional<std::pair<const CBlockIndex*, const CBlockIndex*>> ChainstateManager::GetHistoricalBlockRange() const
{