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Cheap fee calculations (#878)

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* TVM v6

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

* Change unpacked_config_tuple, fix typo

---------

Co-authored-by: SpyCheese <mikle98@yandex.ru>
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EmelyanenkoK 2024-01-26 15:43:53 +03:00 • committed by GitHub
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doc/GlobalVersions.md
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@ -53,4 +53,28 @@ See [this post](https://t.me/tonstatus/88) 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.
* `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.