wit_walrus/
imports.rs

1use crate::TypeId;
2use crate::{FuncId, WasmInterfaceTypes, WitIdsToIndices, WitIndicesToIds};
3use anyhow::Result;
4use id_arena::{Arena, Id};
5
6#[derive(Debug, Default)]
7pub struct Imports {
8    arena: Arena<Import>,
9}
10
11#[derive(Debug)]
12pub struct Import {
13    id: ImportId,
14    pub func: FuncId,
15    pub module: String,
16    pub name: String,
17}
18
19pub type ImportId = Id<Import>;
20
21impl WasmInterfaceTypes {
22    pub(crate) fn parse_imports(
23        &mut self,
24        imports: wit_parser::Imports,
25        wids: &mut WitIndicesToIds,
26    ) -> Result<()> {
27        for import in imports {
28            let import = import?;
29            let ty = wids.ty(import.ty)?;
30            let (func, _) = self.add_import_func(import.module, import.name, ty);
31            wids.funcs.push(func);
32        }
33        Ok(())
34    }
35
36    pub(crate) fn encode_imports(
37        &self,
38        writer: &mut wit_writer::Writer,
39        wids: &mut WitIdsToIndices,
40    ) {
41        let mut w = writer.imports(self.imports.arena.len() as u32);
42        for import in self.imports.iter() {
43            let ty = self.funcs.get(import.func).ty;
44            w.add(&import.module, &import.name, wids.ty(ty));
45            wids.push_func(import.func);
46        }
47    }
48
49    pub fn add_import_func(&mut self, module: &str, name: &str, ty: TypeId) -> (FuncId, ImportId) {
50        let func = self.funcs.add_import(ty, self.imports.arena.next_id());
51        (func, self.imports.add(module, name, func))
52    }
53}
54
55impl Imports {
56    /// Gets a reference to an import given its id
57    pub fn get(&self, id: ImportId) -> &Import {
58        &self.arena[id]
59    }
60
61    /// Gets a reference to an import given its id
62    pub fn get_mut(&mut self, id: ImportId) -> &mut Import {
63        &mut self.arena[id]
64    }
65
66    // /// Removes an import from this module.
67    // ///
68    // /// It is up to you to ensure that any potential references to the deleted
69    // /// import are also removed, eg `get_global` expressions.
70    // pub fn delete(&mut self, id: ImportId) {
71    //     self.arena.delete(id);
72    // }
73
74    /// Get a shared reference to this section's imports.
75    pub fn iter(&self) -> impl Iterator<Item = &Import> {
76        self.arena.iter().map(|(_, f)| f)
77    }
78
79    /// Get mutable references to this section's imports.
80    pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut Import> {
81        self.arena.iter_mut().map(|(_, f)| f)
82    }
83
84    /// Adds a new import to this section
85    pub fn add(&mut self, module: &str, name: &str, func: FuncId) -> ImportId {
86        self.arena.alloc_with_id(|id| Import {
87            id,
88            module: module.to_string(),
89            name: name.to_string(),
90            func,
91        })
92    }
93}
94
95impl Import {
96    /// Returns the identifier for this `Import`
97    pub fn id(&self) -> ImportId {
98        self.id
99    }
100}
wit_walrus/imports.rs

wit_walrus/
imports.rs
