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runtime: don’t unnecessarily copy promise indices #8175

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merged 4 commits into from
Dec 9, 2022
Merged

runtime: don’t unnecessarily copy promise indices #8175

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2e08572
runtime: don’t unnecessarily copy promise indices
mina86 Dec 3, 2022
2d0594c
review
mina86 Dec 7, 2022
2d0446d
Merge remote-tracking branch 'up/master' into HEAD
mina86 Dec 7, 2022
b8d4fea
Merge branch 'master' into c
mina86 Dec 9, 2022
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34 changes: 13 additions & 21 deletions runtime/near-vm-logic/src/logic.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -203,17 +203,6 @@ impl<'a> VMLogic<'a> {
memory_get!(u16, memory_get_u16);
memory_get!(u8, memory_get_u8);

/// Reads an array of `u64` elements.
fn memory_get_vec_u64(&mut self, offset: u64, num_elements: u64) -> Result<Vec<u64>> {
let memory_len = num_elements
.checked_mul(size_of::<u64>() as u64)
.ok_or(HostError::MemoryAccessViolation)?;
let data = self.memory_get_vec(offset, memory_len)?;
let mut res = vec![0u64; num_elements as usize];
byteorder::LittleEndian::read_u64_into(&data, &mut res);
Ok(res)
}

fn get_vec_from_memory_or_register(&mut self, offset: u64, len: u64) -> Result<Vec<u8>> {
if len != u64::MAX {
self.memory_get_vec(offset, len)
Expand Down Expand Up @@ -1371,21 +1360,24 @@ impl<'a> VMLogic<'a> {
);
}
self.gas_counter.pay_base(promise_and_base)?;
self.gas_counter.pay_per(
promise_and_per_promise,
promise_idx_count
.checked_mul(size_of::<u64>() as u64)
.ok_or(HostError::IntegerOverflow)?,
)?;
let memory_len = promise_idx_count
.checked_mul(size_of::<u64>() as u64)
.ok_or(HostError::IntegerOverflow)?;
self.gas_counter.pay_per(promise_and_per_promise, memory_len)?;

let promise_indices = self.memory_get_vec_u64(promise_idx_ptr, promise_idx_count)?;
// Read indices as little endian u64.
let promise_indices = self.memory_get_vec(promise_idx_ptr, memory_len)?;
let promise_indices = stdx::as_chunks_exact::<{ size_of::<u64>() }, u8>(&promise_indices)
.unwrap()
.into_iter()
.map(|bytes| u64::from_le_bytes(*bytes));

let mut receipt_dependencies = vec![];
for promise_idx in &promise_indices {
for promise_idx in promise_indices {
let promise = self
.promises
.get(*promise_idx as usize)
.ok_or(HostError::InvalidPromiseIndex { promise_idx: *promise_idx })?;
.get(promise_idx as usize)
.ok_or(HostError::InvalidPromiseIndex { promise_idx })?;
match &promise {
Promise::Receipt(receipt_idx) => {
receipt_dependencies.push(*receipt_idx);
Expand Down