solana-nostd-entrypoint

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solana-nostd-entrypoint

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- - ci.yml
- - lib.rs
- - integration.rs
- Cargo.toml
- - entrypoint_nostd.rs
  - lib.rs
- Cargo.toml
- README.md
.gitignore
Cargo.lock
Cargo.toml
LICENSE
README.md
rustfmt.toml

// repository documentation

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# `solana-nostd-entrypoint`

The entrypoint function in `solana_program` is grossly inefficient. With an empty `process_instruction` function, it uses upwards of 8000 bpf instructions when the program receives 32 non-duplicate accounts. We use a new `NoStdAccountInfo` struct whose layout is consistent with that in the vm input memory region; unlike the usual entrypoint, it reads everything with no copies and no allocations.

This crate also includes a simple reference program that invokes another program. See `example_program/lib.rs`:

```rust
use {
    solana_msg::sol_log,
    solana_nostd_entrypoint::{
        basic_panic_impl, entrypoint_nostd, noalloc_allocator,
        InstructionC, NoStdAccountInfo,
    },
    solana_program_error::{ProgramError, ProgramResult},
    solana_pubkey::Pubkey,
};

const SYS_PROGRAM_ID: Pubkey =
    solana_pubkey::pubkey!("11111111111111111111111111111111");

entrypoint_nostd!(process_instruction, 32);

pub const ID: Pubkey = solana_pubkey::pubkey!(
    "EWUt9PAjn26zCUALRRt56Gutaj52Bpb8ifbf7GZX3h1k"
);

noalloc_allocator!();
basic_panic_impl!();

pub fn process_instruction(
    _program_id: &Pubkey,
    accounts: &[NoStdAccountInfo],
    _data: &[u8],
) -> ProgramResult {
    log::sol_log("nostd");

// Unpack accounts
    let [user, config, _rem @ ..] = accounts else {
        return Err(ProgramError::NotEnoughAccountKeys);
    };

// Transfer has discriminant 2_u32 (little endian), followed u64 lamport amount
    let mut instruction_data = [0; 12];
    instruction_data[0] = 2;
    instruction_data[4..12].copy_from_slice(&100_000_000_u64.to_le_bytes());

// Instruction accounts are are from, to
    let instruction_accounts = [user.to_meta_c(), config.to_meta_c()];

// Build instruction expected by sol_invoke_signed_c
    let instruction = InstructionC {
        program_id: &SYS_PROGRAM_ID,
        accounts: instruction_accounts.as_ptr(),
        accounts_len: instruction_accounts.len() as u64,
        data: instruction_data.as_ptr(),
        data_len: instruction_data.len() as u64,
    };

// Get infos and seeds
    let infos = [user.to_info_c(), config.to_info_c()];
    let seeds: &[&[&[u8]]] = &[];

// Invoke system program
    #[cfg(target_os = "solana")]
    unsafe {
        solana_program::syscalls::sol_invoke_signed_c(
            &instruction as *const InstructionC as *const u8,
            infos.as_ptr() as *const u8,
            infos.len() as u64,
            seeds.as_ptr() as *const u8,
            seeds.len() as u64,
        );
    }

// For clippy
    #[cfg(not(target_os = "solana"))]
    core::hint::black_box(&(&instruction, &infos, &seeds));

Ok(())
}
```

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