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