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Make allocator limit available for the runtime (#9393)

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* make allocator limit available

* better inner doc

* move const

* fmt

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Guillaume Thiolliere
2021-07-27 15:04:11 +02:00
committed by GitHub
parent 9c173724fa
commit 23e8088c1c
2 changed files with 16 additions and 3 deletions
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substrate/client/allocator/src/freeing_bump.rs
+11 -3
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@@ -68,6 +68,7 @@
//! sizes.
use crate::Error;
pub use sp_core::MAX_POSSIBLE_ALLOCATION;
use sp_wasm_interface::{Pointer, WordSize};
use std::{
convert::{TryFrom, TryInto},
@@ -95,15 +96,13 @@ const LOG_TARGET: &'static str = "wasm-heap";
// The minimum possible allocation size is chosen to be 8 bytes because in that case we would have
// easier time to provide the guaranteed alignment of 8.
//
// The maximum possible allocation size was chosen rather arbitrary. 32 MiB should be enough for
// everybody.
// The maximum possible allocation size is set in the primitives to 32MiB.
//
// N_ORDERS - represents the number of orders supported.
//
// This number corresponds to the number of powers between the minimum possible allocation and
// maximum possible allocation, or: 2^3...2^25 (both ends inclusive, hence 23).
const N_ORDERS: usize = 23;
const MAX_POSSIBLE_ALLOCATION: u32 = 33554432; // 2^25 bytes, 32 MiB
const MIN_POSSIBLE_ALLOCATION: u32 = 8; // 2^3 bytes, 8 bytes
/// The exponent for the power of two sized block adjusted to the minimum size.
@@ -922,4 +921,13 @@ mod tests {
assert!(heap.poisoned);
assert!(heap.deallocate(mem.as_mut(), alloc_ptr).is_err());
}
#[test]
fn test_n_orders() {
// Test that N_ORDERS is consistent with min and max possible allocation.
assert_eq!(
MIN_POSSIBLE_ALLOCATION * 2u32.pow(N_ORDERS as u32 - 1),
MAX_POSSIBLE_ALLOCATION
);
}
}