mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-26 07:37:57 +00:00
Dmitry Kashitsyn
145abd7991
* Moves wasmi specific `ImportResolver` and `MemoryTransfer` impls to submodule * Splits context store environmental, moves impl `Externals` to wasmi backend * Adds wasmer sandbox backend stub module * Move sandbox impl code to backend specific modules * Moves wasmi stuff * Fixes value conversion * Makes it all compile * Remove `with_context_store` * Moves `WasmerBackend` to the impl * Reformat the source * Moves wasmer MemoryWrapper * Reformats the source * Fixes mutability * Moves backend impls to a submodule * Fix visibility * Reformat the source * Feature gate wasmer backend module * Moves wasmi memory allocation to backend module * Rename WasmerBackend to Backend * Refactor dispatch result decoding, get rid of Wasmi types in common sandbox code * Reformat the source * Remove redundant prefixes in backend functions * Remove wasmer-sandbox from default features * Post-review changes * Add conversion soundness proof * Remove redundant prefix * Removes now redundant clone_inner * Add `Error::SandboxBackend`, refactor invoke result * Fix comments * Rename `Error::SandboxBackend` to `Sandbox` * Simplifies logic in `wasmer_backend::invoke` * Fixes memory management
53 lines
1.9 KiB
Rust
53 lines
1.9 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2019-2022 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
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// This program 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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// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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//! Utilities used by all backends
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use crate::error::Result;
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use sp_wasm_interface::Pointer;
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use std::ops::Range;
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/// Construct a range from an offset to a data length after the offset.
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/// Returns None if the end of the range would exceed some maximum offset.
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pub fn checked_range(offset: usize, len: usize, max: usize) -> Option<Range<usize>> {
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let end = offset.checked_add(len)?;
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if end <= max {
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Some(offset..end)
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} else {
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None
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}
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}
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/// Provides safe memory access interface using an external buffer
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pub trait MemoryTransfer {
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/// Read data from a slice of memory into a newly allocated buffer.
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///
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/// Returns an error if the read would go out of the memory bounds.
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fn read(&self, source_addr: Pointer<u8>, size: usize) -> Result<Vec<u8>>;
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/// Read data from a slice of memory into a destination buffer.
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///
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/// Returns an error if the read would go out of the memory bounds.
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fn read_into(&self, source_addr: Pointer<u8>, destination: &mut [u8]) -> Result<()>;
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/// Write data to a slice of memory.
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///
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/// Returns an error if the write would go out of the memory bounds.
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fn write_from(&self, dest_addr: Pointer<u8>, source: &[u8]) -> Result<()>;
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}
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