solana_runtime/bank/
address_lookup_table.rs

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use {
    super::Bank,
    solana_sdk::{
        address_lookup_table::error::AddressLookupError,
        clock::Slot,
        message::{
            v0::{LoadedAddresses, MessageAddressTableLookup},
            AddressLoaderError,
        },
        transaction::AddressLoader,
    },
};

fn into_address_loader_error(err: AddressLookupError) -> AddressLoaderError {
    match err {
        AddressLookupError::LookupTableAccountNotFound => {
            AddressLoaderError::LookupTableAccountNotFound
        }
        AddressLookupError::InvalidAccountOwner => AddressLoaderError::InvalidAccountOwner,
        AddressLookupError::InvalidAccountData => AddressLoaderError::InvalidAccountData,
        AddressLookupError::InvalidLookupIndex => AddressLoaderError::InvalidLookupIndex,
    }
}

impl AddressLoader for &Bank {
    fn load_addresses(
        self,
        address_table_lookups: &[MessageAddressTableLookup],
    ) -> Result<LoadedAddresses, AddressLoaderError> {
        self.load_addresses_from_ref(address_table_lookups.iter())
            .map(|(loaded_addresses, _deactivation_slot)| loaded_addresses)
    }
}

impl Bank {
    /// Load addresses from an iterator of `SVMMessageAddressTableLookup`,
    /// additionally returning the minimum deactivation slot across all referenced ALTs
    pub fn load_addresses_from_ref<'a>(
        &self,
        address_table_lookups: impl Iterator<Item = &'a MessageAddressTableLookup>,
    ) -> Result<(LoadedAddresses, Slot), AddressLoaderError> {
        let slot_hashes = self
            .transaction_processor
            .sysvar_cache()
            .get_slot_hashes()
            .map_err(|_| AddressLoaderError::SlotHashesSysvarNotFound)?;

        let mut deactivation_slot = u64::MAX;
        let loaded_addresses = address_table_lookups
            .map(|address_table_lookup| {
                self.rc
                    .accounts
                    .load_lookup_table_addresses(
                        &self.ancestors,
                        address_table_lookup,
                        &slot_hashes,
                    )
                    .map(|(loaded_addresses, table_deactivation_slot)| {
                        deactivation_slot = deactivation_slot.min(table_deactivation_slot);
                        loaded_addresses
                    })
                    .map_err(into_address_loader_error)
            })
            .collect::<Result<_, _>>()?;

        Ok((loaded_addresses, deactivation_slot))
    }
}