Line data    Source code

       1             : #ifndef HEADER_fd_src_flamenco_runtime_fd_borrowed_account_h
       2             : #define HEADER_fd_src_flamenco_runtime_fd_borrowed_account_h
       3             : 
       4             : #include "fd_bank.h"
       5             : #include "fd_executor_err.h"
       6             : #include "sysvar/fd_sysvar_rent.h"
       7             : 
       8           0 : #define MAX_PERMITTED_DATA_LENGTH                 (FD_RUNTIME_ACC_SZ_MAX) /* 10MiB */
       9             : #define MAX_PERMITTED_ACCOUNT_DATA_ALLOCS_PER_TXN (10UL<<21) /* 20MiB */
      10             : 
      11             : /* TODO: Not all Agave Borrowed Account API functions are implemented here */
      12             : 
      13             : /* TODO: check that borrow is active when calling these APIs */
      14             : 
      15             : struct fd_borrowed_account {
      16             :   ulong                       magic;
      17             :   fd_txn_account_t *          acct;
      18             :   fd_exec_instr_ctx_t const * instr_ctx;
      19             : 
      20             :   /* index_in_instruction will be USHORT_MAX for borrowed program accounts because
      21             :      they are not stored in the list of instruction accounts in the instruction context */
      22             :   ushort                      index_in_instruction;
      23             : };
      24             : typedef struct fd_borrowed_account fd_borrowed_account_t;
      25             : 
      26           0 : #define FD_BORROWED_ACCOUNT_MAGIC (0xFDB07703ACC736C0UL) /* FD BORROW ACCT MGC version 0 */
      27             : /* prevents borrowed accounts from going out of scope without releasing a borrow */
      28           0 : #define fd_guarded_borrowed_account_t __attribute__((cleanup(fd_borrowed_account_destroy))) fd_borrowed_account_t
      29             : 
      30             : FD_PROTOTYPES_BEGIN
      31             : 
      32             : /* Constructor */
      33             : 
      34             : static inline void
      35             : fd_borrowed_account_init( fd_borrowed_account_t *     borrowed_acct,
      36             :                           fd_txn_account_t *          acct,
      37             :                           fd_exec_instr_ctx_t const * instr_ctx,
      38           0 :                           ushort                      index_in_instruction ) {
      39           0 :   borrowed_acct->acct                 = acct;
      40           0 :   borrowed_acct->instr_ctx            = instr_ctx;
      41           0 :   borrowed_acct->index_in_instruction = index_in_instruction;
      42             : 
      43           0 :   FD_COMPILER_MFENCE();
      44           0 :   borrowed_acct->magic = FD_BORROWED_ACCOUNT_MAGIC;
      45           0 :   FD_COMPILER_MFENCE();
      46           0 : }
      47             : 
      48             : /* Drop mirrors the behavior of rust's std::mem::drop on mutable borrows.
      49             :    Releases the acquired write on the borrowed account object. */
      50             : 
      51             : static inline void
      52           0 : fd_borrowed_account_drop( fd_borrowed_account_t * borrowed_acct ) {
      53           0 :   fd_txn_account_drop( borrowed_acct->acct );
      54           0 : }
      55             : 
      56             : /* Destructor  */
      57             : 
      58             : static inline void
      59           0 : fd_borrowed_account_destroy( fd_borrowed_account_t * borrowed_acct ) {
      60           0 :   if( FD_LIKELY( borrowed_acct->magic == FD_BORROWED_ACCOUNT_MAGIC ) ) {
      61           0 :     fd_borrowed_account_drop( borrowed_acct );
      62           0 :   }
      63             : 
      64           0 :   FD_COMPILER_MFENCE();
      65           0 :   FD_VOLATILE( borrowed_acct->magic ) = 0UL;
      66           0 :   FD_COMPILER_MFENCE();
      67             : 
      68           0 :   borrowed_acct = NULL;
      69           0 : }
      70             : 
      71             : /* Getters */
      72             : 
      73             : /* fd_borrowed_account_get_data mirrors Agave function
      74             :    solana_sdk::transaction_context::BorrowedAccount::get_data.
      75             : 
      76             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L817 */
      77             : 
      78             : static inline uchar const *
      79           0 : fd_borrowed_account_get_data( fd_borrowed_account_t const * borrowed_acct ) {
      80           0 :   return fd_txn_account_get_data( borrowed_acct->acct );
      81           0 : }
      82             : 
      83             : static inline ulong
      84           0 : fd_borrowed_account_get_data_len( fd_borrowed_account_t const * borrowed_acct ) {
      85           0 :   return fd_txn_account_get_data_len( borrowed_acct->acct );
      86           0 : }
      87             : 
      88             : /* fd_borrowed_account_get_data_mut mirrors Agave function
      89             :    solana_sdk::transaction_context::BorrowedAccount::get_data_mut.
      90             : 
      91             :    Returns a writable slice of the account data (transaction wide).
      92             :    Acquires a writable handle. This function assumes that the relevant
      93             :    borrowed has already acquired exclusive write access.
      94             : 
      95             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L823 */
      96             : 
      97             : int
      98             : fd_borrowed_account_get_data_mut( fd_borrowed_account_t * borrowed_acct,
      99             :                                   uchar * *               data_out,
     100             :                                   ulong *                 dlen_out );
     101             : 
     102             : static inline fd_pubkey_t const *
     103           0 : fd_borrowed_account_get_owner( fd_borrowed_account_t const * borrowed_acct ) {
     104           0 :   return fd_txn_account_get_owner( borrowed_acct->acct );
     105           0 : }
     106             : 
     107             : /* fd_borrowed_account_get_lamports mirrors Agave function
     108             :    solana_sdk::transaction_context::BorrowedAccount::get_lamports.
     109             : 
     110             :    Returns current number of lamports in account.  Well behaved if meta
     111             :    is NULL.
     112             : 
     113             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L767 */
     114             : 
     115             : static inline ulong
     116           0 : fd_borrowed_account_get_lamports( fd_borrowed_account_t const * borrowed_acct ) {
     117           0 :   return fd_txn_account_get_lamports( borrowed_acct->acct );
     118           0 : }
     119             : 
     120             : /* fd_borrowed_account_get_rent_epoch mirrors Agave function
     121             :    solana_sdk::transaction_context::BorrowedAccount::get_rent_epoch.
     122             : 
     123             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1034 */
     124             : 
     125             : static inline ulong
     126           0 : fd_borrowed_account_get_rent_epoch( fd_borrowed_account_t const * borrowed_acct ) {
     127           0 :   return fd_txn_account_get_rent_epoch( borrowed_acct->acct );
     128           0 : }
     129             : 
     130             : static inline fd_account_meta_t const *
     131           0 : fd_borrowed_account_get_acc_meta( fd_borrowed_account_t const * borrowed_acct ) {
     132           0 :   return fd_txn_account_get_meta( borrowed_acct->acct );
     133           0 : }
     134             : 
     135             : /* Setters */
     136             : 
     137             : /* fd_borrowed_account_set_owner mirrors Agave function
     138             :    solana_sdk::transaction_context::BorrowedAccount::set_owner.
     139             : 
     140             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L739 */
     141             : 
     142             : int
     143             : fd_borrowed_account_set_owner( fd_borrowed_account_t * borrowed_acct,
     144             :                                fd_pubkey_t const *     owner );
     145             : 
     146             : /* fd_borrowed_account_set_lamports mirrors Agave function
     147             :    solana_sdk::transaction_context::BorrowedAccount::set_lamports.
     148             : 
     149             :    Runs through a sequence of permission checks, then sets the account
     150             :    balance.  Does not update global capitalization.  On success, returns
     151             :    0 and updates meta->lamports.  On failure, returns an
     152             :    FD_EXECUTOR_INSTR_ERR_{...} code.  Acquires a writable handle.
     153             : 
     154             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L773 */
     155             : 
     156             : int
     157             : fd_borrowed_account_set_lamports( fd_borrowed_account_t * borrowed_acct,
     158             :                                   ulong                   lamports );
     159             : 
     160             : /* fd_borrowed_account_set_data_from_slice mirrors Agave function
     161             :    solana_sdk::transaction_context::BorrowedAccount::set_data_from_slice.
     162             : 
     163             :    In the firedancer client, it also mirrors the Agave function
     164             :    solana_sdk::transaction_context::BorrowedAccount::set_data.
     165             :    Assumes that destination account already has enough space to fit
     166             :    data.  Acquires a writable handle.
     167             : 
     168             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L864 */
     169             : 
     170             : int
     171             : fd_borrowed_account_set_data_from_slice( fd_borrowed_account_t * borrowed_acct,
     172             :                                          uchar const *           data,
     173             :                                          ulong                   data_sz );
     174             : 
     175             : /* fd_borrowed_account_set_data_length mirrors Agave function
     176             :    solana_sdk::transaction_context::BorrowedAccount::set_data_length.
     177             : 
     178             :    Acquires a writable handle. Returns 0 on success.
     179             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L882 */
     180             : 
     181             : int
     182             : fd_borrowed_account_set_data_length( fd_borrowed_account_t * borrowed_acct,
     183             :                                      ulong                   new_len );
     184             : 
     185             : /* fd_borrowed_account_set_executable mirrors Agave function
     186             :    solana_sdk::transaction_context::BorrowedAccount::set_executable.
     187             : 
     188             :    Returns FD_EXECUTOR_INSTR_SUCCESS if the set is successful.
     189             : 
     190             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L10015 */
     191             : 
     192             : int
     193             : fd_borrowed_account_set_executable( fd_borrowed_account_t * borrowed_acct,
     194             :                                     int                     is_executable );
     195             : 
     196             : /* Operators */
     197             : 
     198             : /* fd_borrowed_account_checked_add_lamports mirros Agave function
     199             :    solana_sdk::transaction_context::BorrowedAccount::checked_add_lamports.
     200             : 
     201             :    Does not update global capitalization. Returns 0 on
     202             :    success or an FD_EXECUTOR_INSTR_ERR_{...} code on failure.
     203             :    Gracefully handles underflow.
     204             : 
     205             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L797 */
     206             : 
     207             : static inline int
     208             : fd_borrowed_account_checked_add_lamports( fd_borrowed_account_t * borrowed_acct,
     209           0 :                                           ulong                   lamports ) {
     210           0 :   ulong balance_post = 0UL;
     211           0 :   int err = fd_ulong_checked_add( fd_txn_account_get_lamports( borrowed_acct->acct ),
     212           0 :                                   lamports,
     213           0 :                                   &balance_post );
     214           0 :   if( FD_UNLIKELY( err ) ) {
     215           0 :     return FD_EXECUTOR_INSTR_ERR_ARITHMETIC_OVERFLOW;
     216           0 :   }
     217             : 
     218           0 :   return fd_borrowed_account_set_lamports( borrowed_acct, balance_post );
     219           0 : }
     220             : 
     221             : /* fd_borrowed_account_checked_sub_lamports mirrors Agave function
     222             :    solana_sdk::transaction_context::BorrowedAccount::checked_sub_lamports.
     223             : 
     224             :    Does not update global capitalization. Returns 0 on
     225             :    success or an FD_EXECUTOR_INSTR_ERR_{...} code on failure.
     226             :    Gracefully handles underflow.
     227             : 
     228             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L807 */
     229             : 
     230             : static inline int
     231             : fd_borrowed_account_checked_sub_lamports( fd_borrowed_account_t * borrowed_acct,
     232           0 :                                           ulong                   lamports ) {
     233           0 :   ulong balance_post = 0UL;
     234           0 :   int err = fd_ulong_checked_sub( fd_txn_account_get_lamports( borrowed_acct->acct ),
     235           0 :                                   lamports,
     236           0 :                                   &balance_post );
     237           0 :   if( FD_UNLIKELY( err ) ) {
     238           0 :     return FD_EXECUTOR_INSTR_ERR_ARITHMETIC_OVERFLOW;
     239           0 :   }
     240             : 
     241           0 :   return fd_borrowed_account_set_lamports( borrowed_acct, balance_post );
     242           0 : }
     243             : 
     244             : /* fd_borrowed_account_update_acounts_resize_delta mirrors Agave function
     245             :    solana_sdk::transaction_context:BorrowedAccount::update_accounts_resize_delta.
     246             : 
     247             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1123 */
     248             : 
     249             : int
     250             : fd_borrowed_account_update_accounts_resize_delta( fd_borrowed_account_t * borrowed_acct,
     251             :                                                   ulong                         new_len,
     252             :                                                   int *                         err );
     253             : 
     254             : /* Accessors */
     255             : 
     256             : /* fd_borrowed_account_is_rent_exempt_at_data_length mirrors Agave function
     257             :    solana_sdk::transaction_context::BorrowedAccount::is_rent_exempt_at_data_length.
     258             : 
     259             :    Returns 1 if an account is rent exempt at it's current data length.
     260             : 
     261             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L987 */
     262             : 
     263             : static inline int
     264           0 : fd_borrowed_account_is_rent_exempt_at_data_length( fd_borrowed_account_t const * borrowed_acct ) {
     265           0 :   fd_txn_account_t * acct = borrowed_acct->acct;
     266           0 :   if( FD_UNLIKELY( !fd_txn_account_get_meta( acct ) ) ) FD_LOG_ERR(( "account is not setup" ));
     267           0 : 
     268           0 :   /* TODO: Add an is_exempt rent API to better match Agave and clean up code
     269           0 :      https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L990 */
     270           0 :   fd_rent_t const * rent        = fd_bank_rent_query( borrowed_acct->instr_ctx->txn_ctx->bank );
     271           0 :   ulong             min_balance = fd_rent_exempt_minimum_balance( rent, fd_txn_account_get_data_len( acct ) );
     272           0 :   return fd_txn_account_get_lamports( acct )>=min_balance;
     273           0 : }
     274             : 
     275             : /* fd_borrowed_account_is_executable mirrors Agave function
     276             :    solana_sdk::transaction_context::BorrowedAccount::is_executable.
     277             : 
     278             :    Returns 1 if the given account has the
     279             :    executable flag set.  Otherwise, returns 0.
     280             : 
     281             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L995 */
     282             : 
     283             : FD_FN_PURE static inline int
     284           0 : fd_borrowed_account_is_executable( fd_borrowed_account_t const * borrowed_acct ) {
     285           0 :   return fd_txn_account_is_executable( borrowed_acct->acct );
     286           0 : }
     287             : 
     288             : /* fd_borrowed_account_is_executable_internal is a private function for deprecating the `is_executable` flag.
     289             :    It returns true if the `remove_accounts_executable_flag_checks` feature is inactive AND fd_account_is_executable
     290             :    return true. This is newly used in account modification logic to eventually allow "executable" accounts to be
     291             :    modified.
     292             : 
     293             :    https://github.com/anza-xyz/agave/blob/89872fdb074e6658646b2b57a299984f0059cc84/sdk/transaction-context/src/lib.rs#L1052-L1060 */
     294             : 
     295             : FD_FN_PURE static inline int
     296           0 : fd_borrowed_account_is_executable_internal( fd_borrowed_account_t const * borrowed_acct ) {
     297           0 :   return !FD_FEATURE_ACTIVE( borrowed_acct->instr_ctx->txn_ctx->slot, &borrowed_acct->instr_ctx->txn_ctx->features, remove_accounts_executable_flag_checks ) &&
     298           0 :           fd_borrowed_account_is_executable( borrowed_acct );
     299           0 : }
     300             : 
     301             : FD_FN_PURE static inline int
     302           0 : fd_borrowed_account_is_mutable( fd_borrowed_account_t const * borrowed_acct ) {
     303           0 :   return fd_txn_account_is_mutable( borrowed_acct->acct );
     304           0 : }
     305             : 
     306             : /* fd_borrowed_account_is_signer mirrors the Agave function
     307             :    solana_sdk::transaction_context::BorrowedAccount::is_signer.
     308             :    Returns 1 if the account is a signer or is writable and 0 otherwise.
     309             : 
     310             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1039 */
     311             : 
     312             : static inline int
     313           0 : fd_borrowed_account_is_signer( fd_borrowed_account_t const * borrowed_acct ) {
     314           0 :   fd_exec_instr_ctx_t const * instr_ctx = borrowed_acct->instr_ctx;
     315           0 :   fd_instr_info_t     const * instr     = instr_ctx->instr;
     316             : 
     317           0 :   if( FD_UNLIKELY( borrowed_acct->index_in_instruction>=instr_ctx->instr->acct_cnt ) ) {
     318           0 :     return 0;
     319           0 :   }
     320             : 
     321           0 :   return fd_instr_acc_is_signer_idx( instr, borrowed_acct->index_in_instruction );
     322           0 : }
     323             : 
     324             : /* fd_borrowed_account_is_writer mirrors the Agave function
     325             :    solana_sdk::transaction_context::BorrowedAccount::is_writer.
     326             :    Returns 1 if the account is a signer or is writable and 0 otherwise.
     327             : 
     328             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1052 */
     329             : 
     330             : static inline int
     331           0 : fd_borrowed_account_is_writable( fd_borrowed_account_t const * borrowed_acct ) {
     332           0 :   fd_exec_instr_ctx_t const * instr_ctx = borrowed_acct->instr_ctx;
     333           0 :   fd_instr_info_t     const * instr     = instr_ctx->instr;
     334             : 
     335           0 :   if( FD_UNLIKELY( borrowed_acct->index_in_instruction>=instr_ctx->instr->acct_cnt ) ) {
     336           0 :     return 0;
     337           0 :   }
     338             : 
     339           0 :   return fd_instr_acc_is_writable_idx( instr, borrowed_acct->index_in_instruction );
     340           0 : }
     341             : 
     342             : /* fd_borrowed_account_is_owned_by_current_program mirrors Agave's
     343             :    solana_sdk::transaction_context::BorrowedAccount::is_owned_by_current_program.
     344             : 
     345             :    Returns 1 if the given
     346             :    account is owned by the program invoked in the current instruction.
     347             :    Otherwise, returns 0.
     348             : 
     349             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1065 */
     350             : 
     351             : FD_FN_PURE static inline int
     352           0 : fd_borrowed_account_is_owned_by_current_program( fd_borrowed_account_t const * borrowed_acct ) {
     353           0 :   fd_pubkey_t const * program_id_pubkey = NULL;
     354           0 :   int err = fd_exec_instr_ctx_get_last_program_key( borrowed_acct->instr_ctx, &program_id_pubkey );
     355           0 :   if( FD_UNLIKELY( err ) ) {
     356           0 :     return 0;
     357           0 :   }
     358             : 
     359           0 :   return !memcmp( program_id_pubkey->key,
     360           0 :                  fd_txn_account_get_owner( borrowed_acct->acct ), sizeof(fd_pubkey_t) );
     361           0 : }
     362             : 
     363             : /* fd_borrowed_account_can_data_be changed mirrors Agave function
     364             :    solana_sdk::transaction_context::BorrowedAccount::can_data_be_changed.
     365             : 
     366             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1074 */
     367             : 
     368             : static inline int
     369             : fd_borrowed_account_can_data_be_changed( fd_borrowed_account_t const * borrowed_acct,
     370           0 :                                          int *                       err ) {
     371             :   /* Only non-executable accounts data can be changed
     372             :      https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1076 */
     373           0 :   if( FD_UNLIKELY( fd_borrowed_account_is_executable_internal( borrowed_acct ) ) ) {
     374           0 :     *err = FD_EXECUTOR_INSTR_ERR_EXECUTABLE_DATA_MODIFIED;
     375           0 :     return 0;
     376           0 :   }
     377             : 
     378             :   /* And only if the account is writable
     379             :      https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1080 */
     380           0 :   if( FD_UNLIKELY( !fd_borrowed_account_is_writable( borrowed_acct ) ) ) {
     381           0 :     *err = FD_EXECUTOR_INSTR_ERR_READONLY_DATA_MODIFIED;
     382           0 :     return 0;
     383           0 :   }
     384             : 
     385             :   /* And only if we are the owner
     386             :      https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1084 */
     387           0 :   if( FD_UNLIKELY( !fd_borrowed_account_is_owned_by_current_program( borrowed_acct ) ) ) {
     388           0 :     *err = FD_EXECUTOR_INSTR_ERR_EXTERNAL_DATA_MODIFIED;
     389           0 :     return 0;
     390           0 :   }
     391             : 
     392           0 :   *err = FD_EXECUTOR_INSTR_SUCCESS;
     393           0 :   return 1;
     394           0 : }
     395             : 
     396             : /* fd_borrowed_account_can_data_be_resized mirrors Agave function
     397             :    solana_sdk::transaction_context::BorrowedAccount::can_data_be_resized
     398             : 
     399             :    https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1092 */
     400             : 
     401             : static inline int
     402             : fd_borrowed_account_can_data_be_resized( fd_borrowed_account_t const * borrowed_acct,
     403             :                                          ulong                         new_length,
     404           0 :                                          int *                         err ) {
     405           0 :   fd_txn_account_t * acct = borrowed_acct->acct;
     406             : 
     407             :   /* Only the owner can change the length of the data
     408             :      https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1095 */
     409           0 :   if( FD_UNLIKELY( (fd_txn_account_get_data_len( acct )!=new_length) &
     410           0 :                    (!fd_borrowed_account_is_owned_by_current_program( borrowed_acct )) ) ) {
     411           0 :     *err = FD_EXECUTOR_INSTR_ERR_ACC_DATA_SIZE_CHANGED;
     412           0 :     return 0;
     413           0 :   }
     414             : 
     415             :   /* The new length can not exceed the maximum permitted length
     416             :      https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1099 */
     417           0 :   if( FD_UNLIKELY( new_length>MAX_PERMITTED_DATA_LENGTH ) ) {
     418           0 :     *err = FD_EXECUTOR_INSTR_ERR_INVALID_REALLOC;
     419           0 :     return 0;
     420           0 :   }
     421             : 
     422             :   /* The resize can not exceed the per-transaction maximum
     423             :      https://github.com/anza-xyz/agave/blob/v2.1.14/sdk/src/transaction_context.rs#L1104-L1108 */
     424           0 :   ulong length_delta              = fd_ulong_sat_sub( new_length, fd_txn_account_get_data_len( acct ) );
     425           0 :   ulong new_accounts_resize_delta = fd_ulong_sat_add( borrowed_acct->instr_ctx->txn_ctx->accounts_resize_delta, length_delta );
     426           0 :   if( FD_UNLIKELY( new_accounts_resize_delta > MAX_PERMITTED_ACCOUNT_DATA_ALLOCS_PER_TXN ) ) {
     427           0 :     *err = FD_EXECUTOR_INSTR_ERR_MAX_ACCS_DATA_ALLOCS_EXCEEDED;
     428           0 :     return 0;
     429           0 :   }
     430             : 
     431           0 :   *err = FD_EXECUTOR_INSTR_SUCCESS;
     432           0 :   return 1;
     433           0 : }
     434             : 
     435             : FD_FN_PURE static inline int
     436           0 : fd_borrowed_account_is_zeroed( fd_borrowed_account_t const * borrowed_acct ) {
     437           0 :   fd_txn_account_t * acct = borrowed_acct->acct;
     438             :   /* TODO: optimize this */
     439           0 :   uchar const * data = fd_txn_account_get_data( acct );
     440           0 :   for( ulong i=0UL; i<fd_txn_account_get_data_len( acct ); i++ ) {
     441           0 :     if( data[i] != 0 ) {
     442           0 :       return 0;
     443           0 :     }
     444           0 :   }
     445           0 :   return 1;
     446           0 : }
     447             : 
     448             : FD_PROTOTYPES_END
     449             : 
     450             : #endif /* HEADER_fd_src_flamenco_runtime_fd_borrowed_account_h */