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