wasmer_types/
initializers.rs

1use crate::indexes::{FunctionIndex, GlobalIndex, MemoryIndex, TableIndex};
2use crate::lib::std::boxed::Box;
3
4/// A WebAssembly table initializer.
5#[derive(Clone, Debug, Hash, PartialEq, Eq, rkyv::Serialize, rkyv::Deserialize, rkyv::Archive)]
6pub struct OwnedTableInitializer {
7    /// The index of a table to initialize.
8    pub table_index: TableIndex,
9    /// Optionally, a global variable giving a base index.
10    pub base: Option<GlobalIndex>,
11    /// The offset to add to the base.
12    pub offset: usize,
13    /// The values to write into the table elements.
14    pub elements: Box<[FunctionIndex]>,
15}
16
17/// A memory index and offset within that memory where a data initialization
18/// should be performed.
19#[derive(Clone, Debug, PartialEq, Eq, rkyv::Serialize, rkyv::Deserialize, rkyv::Archive)]
20pub struct DataInitializerLocation {
21    /// The index of the memory to initialize.
22    pub memory_index: MemoryIndex,
23
24    /// Optionally a Global variable base to initialize at.
25    pub base: Option<GlobalIndex>,
26
27    /// A constant offset to initialize at.
28    pub offset: usize,
29}
30
31/// A data initializer for linear memory.
32#[derive(Debug)]
33pub struct DataInitializer<'data> {
34    /// The location where the initialization is to be performed.
35    pub location: DataInitializerLocation,
36
37    /// The initialization data.
38    pub data: &'data [u8],
39}
40
41/// As `DataInitializer` but owning the data rather than
42/// holding a reference to it
43#[derive(Debug, Clone, PartialEq, Eq, rkyv::Serialize, rkyv::Deserialize, rkyv::Archive)]
44pub struct OwnedDataInitializer {
45    /// The location where the initialization is to be performed.
46    pub location: DataInitializerLocation,
47
48    /// The initialization owned data.
49    pub data: Vec<u8>,
50}
51
52impl OwnedDataInitializer {
53    /// Creates a new `OwnedDataInitializer` from a `DataInitializer`.
54    pub fn new(borrowed: &DataInitializer<'_>) -> Self {
55        Self {
56            location: borrowed.location.clone(),
57            data: borrowed.data.to_vec(),
58        }
59    }
60}
61
62impl<'a> From<&'a OwnedDataInitializer> for DataInitializer<'a> {
63    fn from(init: &'a OwnedDataInitializer) -> Self {
64        DataInitializer {
65            location: init.location.clone(),
66            data: &*init.data,
67        }
68    }
69}
70
71impl<'a> From<&'a ArchivedOwnedDataInitializer> for DataInitializer<'a> {
72    fn from(init: &'a ArchivedOwnedDataInitializer) -> Self {
73        DataInitializer {
74            location: rkyv::Deserialize::deserialize(&init.location, &mut rkyv::Infallible)
75                .expect("deserialization cannot fail"),
76            data: &*init.data,
77        }
78    }
79}
80
81impl<'a> From<DataInitializer<'a>> for OwnedDataInitializer {
82    fn from(init: DataInitializer<'a>) -> Self {
83        OwnedDataInitializer {
84            location: init.location.clone(),
85            data: init.data.to_vec(),
86        }
87    }
88}
wasmer_types/initializers.rs

wasmer_types/
initializers.rs
