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Update serialization docs

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Jack May 2020-12-15 08:37:35 -08:00 committed by Michael Vines
parent 53fe0bb5eb
commit 03fc031611
1 changed files with 11 additions and 11 deletions
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docs/src/developing/deployed-programs/overview.md
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@ -157,21 +157,27 @@ For further information see [deploying](deploying.md)
### Input Parameter Serialization
BPF loaders serialize the program input parameters into a byte array that is
then passed to the program's entrypoint where the program is responsible for
then passed to the program's entrypoint, where the program is responsible for
deserializing it on-chain. One of the changes between the deprecated loader and
the current loader is that the input parameters are serialized in a way that
results in various parameters falling on aligned offsets within the aligned byte
array. This allows deserialization implementations to directly reference the
byte array and provide aligned pointers to the program.
The current loader serializes the program input parameters as follows (all
For language specific information about serialization see:
- [Rust program parameter
deserialization](developing-rust.md#parameter-deserialization)
- [C program parameter
deserialization](developing-c.md#parameter-deserialization)
The latest loader serializes the program input parameters as follows (all
encoding is little endian):
- 8 byte unsigned number of accounts
- For each account
- 1 byte indicating if this is a duplicate account, if it is a duplicate then
the value is 0, otherwise contains the index of the account it is a
duplicate of
- 1 byte indicating if this is a duplicate account, if not a duplicate then
the value is 0xff, otherwise the value is the index of the account it is a
duplicate of.
- 7 bytes of padding
- if not duplicate
- 1 byte padding
@ -190,9 +196,3 @@ encoding is little endian):
- 8 bytes of unsigned number of instruction data
- x bytes of instruction data
- 32 bytes of the program id
For language specific information about serialization see:
- [Rust program parameter
deserialization](developing-rust.md#parameter-deserialization)
- [C program parameter
deserialization](developing-c.md#parameter-deserialization)