agave

                    let _ref_mut = accounts[readable].try_borrow_data()?;                    invoke(&instruction, accounts)?;                }            }             msg!("Test create_program_address");            {                assert_eq!(                    &Pubkey::create_program_address(                        &[b"You pass butter", &[bump_seed1]],                        program_id                    )?,                    accounts[DERIVED_KEY1_INDEX].key                );                let new_program_id = Pubkey::new_from_array([6u8; 32]);                assert_eq!(                    Pubkey::create_program_address(&[b"You pass butter"], &new_program_id)                        .unwrap_err(),                    PubkeyError::InvalidSeeds                );            }             msg!("Test try_find_program_address");            {

1. Line 254 invoke(&instruction, accounts)?;: Makes a cross-program invocation into another program.
2. Line 258 msg!("Test create_program_address");: Logs to the program log, which is visible in explorers and the test output.
3. Line 275 msg!("Test try_find_program_address");: Derives a PDA from seeds and the program ID and returns the address with its canonical bump.

    std::convert::TryInto,}; solana_program_entrypoint::entrypoint_no_alloc!(process_instruction);fn process_instruction(    program_id: &Pubkey,    accounts: &[AccountInfo],    instruction_data: &[u8],) -> ProgramResult {    let account = &accounts[0];    let invoke_program_id = accounts[1].key;    let pre_len = account.data_len();    let mut bump = 0;     match instruction_data[0] {        INVOKE_REALLOC_ZERO_RO => {            msg!("invoke realloc to zero of ro account");            // Realloc RO account            let mut instruction = realloc(invoke_program_id, account.key, 0, &mut bump);            instruction.accounts[0].is_writable = false;            invoke(&instruction, accounts)?;        }        INVOKE_REALLOC_ZERO => {            msg!("invoke realloc to zero");

1. Line 25 let mut bump = 0;: Uses the bump seed, the extra byte that pushes the derived address off the ed25519 curve.
2. Line 29 msg!("invoke realloc to zero of ro account");: Logs to the program log, which is visible in explorers and the test output.
3. Line 33 invoke(&instruction, accounts)?;: Makes a cross-program invocation into another program.

    pub(crate) epoch: Epoch,    pub(crate) delegated_stakes: Vec<RewardEpochDelegatedStake>,} #[derive(Debug, Clone, SchemaRead, SchemaWrite)]struct RewardEpochDelegatedStake {    pub(crate) vote_pubkey: Pubkey,    pub(crate) delegated_stake: u64,} /// The off-curve account where we store the bounded reward-epoch delegated stake/// denominators used for non-Tower reward recalculation after snapshot restore.static REWARD_EPOCH_DELEGATED_STAKES_ACCOUNT: LazyLock<Pubkey> = LazyLock::new(|| {    let (pubkey, _) = Pubkey::find_program_address(        &[b"reward_epoch_delegated_stakes"],        &agave_feature_set::alpenglow::id(),    );    pubkey}); impl RewardEpochDelegatedStakesAccount {    pub(crate) fn max_size() -> usize {        static REWARD_EPOCH_DELEGATED_STAKES_ACCOUNT_MAX_SIZE: LazyLock<usize> =            LazyLock::new(|| {

1. Line 35 /// The off-curve account where we store the bounded reward-epoch delegated stake: Touches staking state: the amount locked and when it was locked.
2. Line 38 let (pubkey, _) = Pubkey::find_program_address(: Derives a PDA from seeds and the program ID and returns the address with its canonical bump.

        1    }} /// Utility function for creating a stake account from basic parameters./// Only used in tests and CLIs.pub fn create_stake_account_with_activation_and_deactivation_epochs(    authorized: &Pubkey,    voter_pubkey: &Pubkey,    vote_account: &AccountSharedData,    rent: &Rent,    lamports: u64,    activation_epoch: Epoch,    deactivation_epoch: Epoch,) -> AccountSharedData {    let mut stake_account =        AccountSharedData::new(lamports, StakeStateV2::size_of(), &stake_program::id());     let vote_state = VoteStateV4::deserialize(vote_account.data(), voter_pubkey).unwrap();    let credits_observed = vote_state.credits();     let rent_exempt_reserve = rent.minimum_balance(stake_account.data().len());    let stake_amount = lamports        .checked_sub(rent_exempt_reserve)

1. Line 29 /// Utility function for creating a stake account from basic parameters.: Touches staking state: the amount locked and when it was locked.
2. Line 48 .checked_sub(rent_exempt_reserve): Uses checked arithmetic so overflow fails instead of wrapping.