wasmparser/readers/core/
imports.rs

1/* Copyright 2018 Mozilla Foundation
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16use crate::{
17    BinaryReader, ExternalKind, FromReader, GlobalType, MemoryType, Result, SectionLimited,
18    TableType, TagType,
19};
20
21/// Represents a reference to a type definition in a WebAssembly module.
22#[derive(Debug, Clone, Copy, Eq, PartialEq)]
23pub enum TypeRef {
24    /// The type is a function.
25    ///
26    /// The value is an index into the type section.
27    Func(u32),
28    /// The type is a table.
29    Table(TableType),
30    /// The type is a memory.
31    Memory(MemoryType),
32    /// The type is a global.
33    Global(GlobalType),
34    /// The type is a tag.
35    ///
36    /// This variant is only used for the exception handling proposal.
37    ///
38    /// The value is an index in the types index space.
39    Tag(TagType),
40}
41
42/// Represents an import in a WebAssembly module.
43#[derive(Debug, Copy, Clone, Eq, PartialEq)]
44pub struct Import<'a> {
45    /// The module being imported from.
46    pub module: &'a str,
47    /// The name of the imported item.
48    pub name: &'a str,
49    /// The type of the imported item.
50    pub ty: TypeRef,
51}
52
53/// A reader for the import section of a WebAssembly module.
54pub type ImportSectionReader<'a> = SectionLimited<'a, Import<'a>>;
55
56impl<'a> FromReader<'a> for Import<'a> {
57    fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> {
58        Ok(Import {
59            module: reader.read()?,
60            name: reader.read()?,
61            ty: reader.read()?,
62        })
63    }
64}
65
66impl<'a> FromReader<'a> for TypeRef {
67    fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> {
68        Ok(match reader.read()? {
69            ExternalKind::Func => TypeRef::Func(reader.read_var_u32()?),
70            ExternalKind::Table => TypeRef::Table(reader.read()?),
71            ExternalKind::Memory => TypeRef::Memory(reader.read()?),
72            ExternalKind::Global => TypeRef::Global(reader.read()?),
73            ExternalKind::Tag => TypeRef::Tag(reader.read()?),
74        })
75    }
76}
wasmparser/readers/core/imports.rs

wasmparser/readers/core/
imports.rs
