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SIMD-0186: Define LoaderV4 #282

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SIMD-0186: Define LoaderV4 #282

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SIMD-0186: Define LoaderV4
2501babe May 1, 2025
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clarify nonexistant accounts
2501babe May 30, 2025
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16 changes: 7 additions & 9 deletions proposals/0186-loaded-transaction-data-size-specification.md
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Expand Up @@ -79,9 +79,9 @@ irrespective of how they are used.
accounts specified on the transaction.
2. Each account's size is defined as the byte length of its data prior to
transaction execution plus 64 bytes to account for metadata.
3. There is an additional flat 8248 byte cost for transactions that use an
address lookup table, accounting for the 8192 bytes for the maximum size of such
a table plus 56 bytes for metadata.
3. There is an additional flat 8248 byte cost for each address lookup table used
by a transaction, accounting for the 8192 bytes for the maximum size of such a
table plus 56 bytes for metadata.
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I wouldn't mind a clarifying comment stating that the 64 bytes for account metadata is not added here. I think as written the SIMD is probably clear enough though.

4. The total transaction loaded account data size is the sum of these sizes.

Transactions may include a
Expand All @@ -105,14 +105,12 @@ mapping is enabled, this SIMD may be amended to count them differently.
We include programdata size for LoaderV3 programs because using the program
account on a transaction forces an unconditional load of programdata to compile
the program for execution. We always count it, even when the program account is
not a transaction program ID, because the program must be available for CPI.
not a transaction program ID, because the program must be available for CPI. If
the programdata account does not exist, then its size is 0, and transaction
loading continues as normal.

There is no special handling for any account owned by the native loader,
LoaderV1, or LoaderV2.

Account size for programs owned by LoaderV4 is left undefined. This SIMD should
be amended to define the required semantics before LoaderV4 is enabled on any
network.
LoaderV1, LoaderV2, or LoaderV4.
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@Lichtso if you could confirm my understanding is correct

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Yes, only loader-v3 had an indirection. All other loaders (including v4) store the executable directly in the program account.


## Alternatives Considered

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