piecrust 0.30.0

Dusk's virtual machine for running WASM smart contracts.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
// Copyright (c) DUSK NETWORK. All rights reserved.

use std::fs::File;
use std::io;
use std::path::Path;
use std::sync::Arc;

use memmap2::{Mmap, MmapOptions};

/// WASM bytecode belonging to a given contract.
#[derive(Debug, Clone)]
pub struct Bytecode {
    mmap: Arc<Mmap>,
}

impl Bytecode {
    pub(crate) fn new<B: AsRef<[u8]>>(bytes: B) -> io::Result<Self> {
        let bytes = bytes.as_ref();
        let mut mmap = MmapOptions::new().len(bytes.len()).map_anon()?;

        mmap.copy_from_slice(bytes);
        let mmap = mmap.make_read_only()?;

        Ok(Self {
            mmap: Arc::new(mmap),
        })
    }

    pub(crate) fn from_file<P: AsRef<Path>>(path: P) -> io::Result<Self> {
        let file = File::open(path)?;
        let mmap = unsafe { Mmap::map(&file)? };

        Ok(Self {
            mmap: Arc::new(mmap),
        })
    }
}

impl AsRef<[u8]> for Bytecode {
    fn as_ref(&self) -> &[u8] {
        &self.mmap
    }
}