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ton/doc/GlobalVersions.md
EmelyanenkoK 64b04e46d7
Cheap fee calculations (#878) 
* TVM v6

* New tuple with unpacked config parameters in c7
* New instructions for calculating fees

* Change unpacked_config_tuple, fix typo

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Co-authored-by: SpyCheese <mikle98@yandex.ru>
2024-01-26 15:43:53 +03:00

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Global versions

Global version is a parameter specified in ConfigParam 8 (block.tlb). Various features are enabled depending on the global version.

Version 4

New TVM instructions

  • PREVMCBLOCKS, PREVKEYBLOCK
  • GLOBALID
  • HASHEXT(A)(R)
  • ECRECOVER
  • SENDMSG
  • RUNVM, RUNVMX
  • GASCONSUMED
  • RIST255_... instructions
  • BLS_... instructions
  • P256_CHKSIGNS, P256_CHKSIGNU

Division

Division instruction can add a number to the intermediate value before division (e.g. (xy+w)/z).

Stack operations

  • Arguments of PICK, ROLL, ROLLREV, BLKSWX, REVX, DROPX, XCHGX, CHKDEPTH, ONLYTOPX, ONLYX are now unlimited.
  • ROLL, ROLLREV, BLKSWX, REVX, ONLYTOPX consume more gas when arguments are big.

c7 tuple

c7 tuple extended from 10 to 14 elements:

  • 10: code of the smart contract.
  • 11: value of the incoming message.
  • 12: fees collected in the storage phase.
  • 13: information about previous blocks.

Action phase

  • If "send message" action fails, the account is required to pay for processing cells of the message.
  • Flag +16 in actions "Send message", "Reserve", "Change library" causes bounce if action fails.

Storage phase

  • Unpaid storage fee is now saved to due_payment

Version 5

Gas limits

Version 5 enables higher gas limits for special contracts.

  • Gas limit for all transactions on special contracts is set to special_gas_limit from ConfigParam 20 (which is 35M at the moment of writing). Previously only ticktock transactions had this limit, while ordinary transactions had a default limit of gas_limit gas (1M).
  • Gas usage of special contracts is not taken into account when checking block limits. This allows keeping masterchain block limits low while having high gas limits for elector.
  • Gas limit on EQD_v9j1rlsuHHw2FIhcsCFFSD367ldfDdCKcsNmNpIRzUlu is increased to special_gas_limit * 2 until 2024-02-29. See this post for details.

Loading libraries

  • Loading "nested libraries" (i.e. a library cell that points to another library cell) throws an exception.
  • Loading a library consumes gas for cell load only once (for the library cell), not twice (both for the library cell and the cell in the library).
  • XLOAD now works differently. When it takes a library cell, it returns the cell that it points to. This allows loading "nested libraries", if needed.

Version 6

c7 tuple

c7 tuple extended from 14 to 15 elements. The new element is a tuple that contains some config parameters as cell slices. If the parameter is absent from the config, the value is null.

  • 0: StoragePrices from ConfigParam 18. Not the whole dict, but only the one StoragePrices entry (one which corresponds to the current time).
  • 1: ConfigParam 19 (global id).
  • 2: ConfigParam 20 (mc gas prices).
  • 3: ConfigParam 21 (gas prices).
  • 4: ConfigParam 24 (mc fwd fees).
  • 5: ConfigParam 25 (fwd fees).
  • 6: ConfigParam 43 (size limits).

New TVM instructions

  • GETEXECUTIONPRICE (gas_used is_mc - price) - calculates gas fee.
  • GETSTORAGEPRICE (cells bits seconds is_mc - price) - calculates storage fees (only current StoragePrices entry is used).
  • GETFORWARDPRICE (cells bits is_mc - price) - calculates forward fee.
  • GETPRECOMPILEDGAS (- null) - reserved, currently returns null. gas_used, cells, bits, time_delta are integers in range 0..2^63-1.

Other changes

  • GLOBALID gets ConfigParam 19 from the tuple, not from the config dict. This decreases gas usage.
  • SENDMSG gets ConfigParam 24/25 (message prices) from the tuple, not from the config dict, and also uses ConfigParam 43 to get max_msg_cells.