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fix(guest): take the zero-copy input via the safe get_private_input_slice #898

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Merged
MauroToscano merged 1 commit into from
Aug 4, 2026
Merged

fix(guest): take the zero-copy input via the safe get_private_input_slice #898

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15 changes: 6 additions & 9 deletions executor/programs/rust/ethrex/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,15 +5,12 @@ use lambda_vm_ethrex_crypto::LambdaVmEcsmCrypto;
use rkyv::rancor::Error;

pub fn main() {
// Zero-copy private input: `ef_io::read_input` returns a pointer+len into
// the memory-mapped input region (host pre-loads it before execution), so
// rkyv deserializes straight from the input. `get_private_input()` would
// `to_vec()` the whole input first — a full extra copy plus one large
// allocation (~52k cycles on a 20-tx block).
let mut input_ptr: *const u8 = core::ptr::null();
let mut input_len: usize = 0;
unsafe { lambda_vm_syscalls::ef_io::read_input(&mut input_ptr, &mut input_len) };
let input = unsafe { core::slice::from_raw_parts(input_ptr, input_len) };
// Zero-copy private input: borrow the memory-mapped input region in place
// (the host pre-loads it before execution) so rkyv deserializes straight
// out of it. `get_private_input()` is this same slice plus a `to_vec()` —
// a full extra copy and one large allocation (~50k cycles on a 20-tx
// block).
let input = lambda_vm_syscalls::syscalls::get_private_input_slice();
let input = rkyv::from_bytes::<ProgramInput, Error>(input).unwrap();
// LambdaVM crypto provider, defined in the lambda_vm repo and injected here
// (so crypto changes don't require an ethrex PR — see `crypto/ethrex-crypto`).
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