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/* Copyright 2018 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use crate::{
BinaryReader, ExternalKind, FromReader, GlobalType, MemoryType, Result, SectionLimited,
TableType, TagType,
};
/// Represents a reference to a type definition in a WebAssembly module.
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub enum TypeRef {
/// The type is a function.
///
/// The value is an index into the type section.
Func(u32),
/// The type is a table.
Table(TableType),
/// The type is a memory.
Memory(MemoryType),
/// The type is a global.
Global(GlobalType),
/// The type is a tag.
///
/// This variant is only used for the exception handling proposal.
///
/// The value is an index in the types index space.
Tag(TagType),
}
/// Represents an import in a WebAssembly module.
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub struct Import<'a> {
/// The module being imported from.
pub module: &'a str,
/// The name of the imported item.
pub name: &'a str,
/// The type of the imported item.
pub ty: TypeRef,
}
/// A reader for the import section of a WebAssembly module.
pub type ImportSectionReader<'a> = SectionLimited<'a, Import<'a>>;
impl<'a> FromReader<'a> for Import<'a> {
fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> {
Ok(Import {
module: reader.read()?,
name: reader.read()?,
ty: reader.read()?,
})
}
}
impl<'a> FromReader<'a> for TypeRef {
fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self> {
Ok(match reader.read()? {
ExternalKind::Func => TypeRef::Func(reader.read_var_u32()?),
ExternalKind::Table => TypeRef::Table(reader.read()?),
ExternalKind::Memory => TypeRef::Memory(reader.read()?),
ExternalKind::Global => TypeRef::Global(reader.read()?),
ExternalKind::Tag => TypeRef::Tag(reader.read()?),
})
}
}