mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-29 18:27:56 +00:00
Michael Müller
aa5e0658f8
* Decrease bucket size A bucket size of 8192 bytes is quite large and it turned out that this can exhaust the available heap space too too quickly. This is because even for allocating 1 byte a bucket of 8192 bytes is allocated/wasted. * Return 0 if requested size too large * Improve test The test didn't use an offset when setting up the heap. Hence the first successfully allocated pointer was always `0`. This is unfortunate since `0` is also the return value when there is an error. This lead to us not noticing that the test was failing, because it did not distinguish between success and error. * Revert to linear allocator
57 lines
1.6 KiB
Rust
57 lines
1.6 KiB
Rust
// Copyright 2017-2019 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.
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// Substrate is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Substrate is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Substrate. If not, see <http://www.gnu.org/licenses/>.
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#![warn(missing_docs)]
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//! This module implements a linear allocation heap.
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pub struct Heap {
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end: u32,
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total_size: u32,
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}
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impl Heap {
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/// Construct new `Heap` struct.
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///
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/// Returns `Err` if the heap couldn't allocate required
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/// number of pages.
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///
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/// This could mean that wasm binary specifies memory
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/// limit and we are trying to allocate beyond that limit.
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pub fn new(reserved: u32) -> Self {
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Heap {
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end: reserved,
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total_size: 0,
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}
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}
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pub fn allocate(&mut self, size: u32) -> u32 {
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let r = self.end;
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self.end += size;
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let new_total_size = r + size;
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if new_total_size > self.total_size {
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if new_total_size / 1024 > self.total_size / 1024 {
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trace!(target: "wasm-heap", "Allocated over {} MB", new_total_size / 1024 / 1024);
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}
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self.total_size = new_total_size;
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}
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r
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}
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pub fn deallocate(&mut self, _offset: u32) {
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}
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}
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