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use crate::{
BinaryReader, ComponentImport, Import, Result, SectionIteratorLimited, SectionReader,
SectionWithLimitedItems, TypeDef, TypeRef,
};
use std::ops::Range;
/// Represents a type defined in a WebAssembly component.
#[derive(Debug, Clone)]
pub enum ComponentTypeDef<'a> {
/// The type is a module type.
Module(Box<[ModuleType<'a>]>),
/// The type is a component type.
Component(Box<[ComponentType<'a>]>),
/// The type is an instance type.
Instance(Box<[InstanceType<'a>]>),
/// The type is a function type.
Function(ComponentFuncType<'a>),
/// The type is for a value type.
Value(InterfaceTypeRef),
/// The type is for an interface type.
Interface(InterfaceType<'a>),
}
/// Represents a module type definition in a WebAssembly component.
#[derive(Debug, Clone)]
pub enum ModuleType<'a> {
/// The module type definition is for a type.
Type(TypeDef),
/// The module type definition is for an export.
Export {
/// The name of the exported item.
name: &'a str,
/// The type of the exported item.
ty: TypeRef,
},
/// The module type definition is for an import.
Import(Import<'a>),
}
/// Represents a component type definition in a WebAssembly component.
#[derive(Debug, Clone)]
pub enum ComponentType<'a> {
/// The component type definition is for a type.
Type(ComponentTypeDef<'a>),
/// The component type definition is for an alias to an outer type.
OuterType {
/// The enclosing module count, starting at zero for current module.
count: u32,
/// The outer type index being aliased.
index: u32,
},
/// The component type definition is for an export.
Export {
/// The name of the exported item.
name: &'a str,
/// The type index of the exported item.
ty: u32,
},
/// The component type definition is for an import.
Import(ComponentImport<'a>),
}
/// Represents an instance type definition in a WebAssembly component.
#[derive(Debug, Clone)]
pub enum InstanceType<'a> {
/// The instance type definition is for a type.
Type(ComponentTypeDef<'a>),
/// The instance type definition is for an alias to an outer type.
OuterType {
/// The enclosing module count, starting at zero for current module.
count: u32,
/// The outer type index being aliased.
index: u32,
},
/// The instance type definition is for an export.
Export {
/// The name of the exported item.
name: &'a str,
/// The type index of the exported item.
ty: u32,
},
}
/// Represents a type of a function in a WebAssembly component.
#[derive(Debug, Clone)]
pub struct ComponentFuncType<'a> {
/// The function parameter types.
pub params: Box<[(Option<&'a str>, InterfaceTypeRef)]>,
/// The function result type.
pub result: InterfaceTypeRef,
}
/// Represents a primitive interface type.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum PrimitiveInterfaceType {
/// The type is the unit type.
Unit,
/// The type is a boolean.
Bool,
/// The type is a signed 8-bit integer.
S8,
/// The type is an unsigned 8-bit integer.
U8,
/// The type is a signed 16-bit integer.
S16,
/// The type is an unsigned 16-bit integer.
U16,
/// The type is a signed 32-bit integer.
S32,
/// The type is an unsigned 32-bit integer.
U32,
/// The type is a signed 64-bit integer.
S64,
/// The type is an unsigned 64-bit integer.
U64,
/// The type is a 32-bit floating point number.
Float32,
/// The type is a 64-bit floating point number.
Float64,
/// The type is a Unicode character.
Char,
/// The type is a string.
String,
}
impl PrimitiveInterfaceType {
pub(crate) fn requires_into_option(&self) -> bool {
matches!(self, PrimitiveInterfaceType::String)
}
pub(crate) fn is_subtype_of(&self, other: &Self) -> bool {
// Interface subtyping rules according to
// https://github.com/WebAssembly/component-model/blob/17f94ed1270a98218e0e796ca1dad1feb7e5c507/design/mvp/Subtyping.md
self == other
|| matches!(
(self, other),
(_, PrimitiveInterfaceType::Unit)
| (PrimitiveInterfaceType::S8, PrimitiveInterfaceType::S16)
| (PrimitiveInterfaceType::S8, PrimitiveInterfaceType::S32)
| (PrimitiveInterfaceType::S8, PrimitiveInterfaceType::S64)
| (PrimitiveInterfaceType::U8, PrimitiveInterfaceType::U16)
| (PrimitiveInterfaceType::U8, PrimitiveInterfaceType::U32)
| (PrimitiveInterfaceType::U8, PrimitiveInterfaceType::U64)
| (PrimitiveInterfaceType::U8, PrimitiveInterfaceType::S16)
| (PrimitiveInterfaceType::U8, PrimitiveInterfaceType::S32)
| (PrimitiveInterfaceType::U8, PrimitiveInterfaceType::S64)
| (PrimitiveInterfaceType::S16, PrimitiveInterfaceType::S32)
| (PrimitiveInterfaceType::S16, PrimitiveInterfaceType::S64)
| (PrimitiveInterfaceType::U16, PrimitiveInterfaceType::U32)
| (PrimitiveInterfaceType::U16, PrimitiveInterfaceType::U64)
| (PrimitiveInterfaceType::U16, PrimitiveInterfaceType::S32)
| (PrimitiveInterfaceType::U16, PrimitiveInterfaceType::S64)
| (PrimitiveInterfaceType::S32, PrimitiveInterfaceType::S64)
| (PrimitiveInterfaceType::U32, PrimitiveInterfaceType::U64)
| (PrimitiveInterfaceType::U32, PrimitiveInterfaceType::S64)
| (
PrimitiveInterfaceType::Float32,
PrimitiveInterfaceType::Float64
)
)
}
pub(crate) fn type_size(&self) -> usize {
match self {
Self::Unit => 0,
_ => 1,
}
}
}
/// Represents a reference to an interface type.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum InterfaceTypeRef {
/// The reference is to a primitive interface type.
Primitive(PrimitiveInterfaceType),
/// The reference is to an interface type defined in a type section.
Type(u32),
}
/// Represents a case in a variant interface type.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct VariantCase<'a> {
/// The name of the variant case.
pub name: &'a str,
/// The interface type of the variant case.
pub ty: InterfaceTypeRef,
/// The default-to case index to use when this case is not present.
pub default_to: Option<u32>,
}
/// Represents an interface type.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum InterfaceType<'a> {
/// The interface type is one of the primitive types.
Primitive(PrimitiveInterfaceType),
/// The type is a record with the given fields.
Record(Box<[(&'a str, InterfaceTypeRef)]>),
/// The type is a variant with the given cases.
Variant(Box<[VariantCase<'a>]>),
/// The type is a list of the given interface type.
List(InterfaceTypeRef),
/// The type is a tuple of the given interface types.
Tuple(Box<[InterfaceTypeRef]>),
/// The type is flags with the given names.
Flags(Box<[&'a str]>),
/// The type is an enum with the given tags.
Enum(Box<[&'a str]>),
/// The type is a union of the given interface types.
Union(Box<[InterfaceTypeRef]>),
/// The type is an option of the given interface type.
Option(InterfaceTypeRef),
/// The type is an expected type.
Expected {
/// The type returned for success.
ok: InterfaceTypeRef,
/// The type returned for failure.
error: InterfaceTypeRef,
},
}
/// A reader for the type section of a WebAssembly component.
#[derive(Clone)]
pub struct ComponentTypeSectionReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> ComponentTypeSectionReader<'a> {
/// Constructs a new `ComponentTypeSectionReader` for the given data and offset.
pub fn new(data: &'a [u8], offset: usize) -> Result<Self> {
let mut reader = BinaryReader::new_with_offset(data, offset);
let count = reader.read_var_u32()?;
Ok(Self { reader, count })
}
/// Gets the original position of the reader.
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
/// Gets a count of items in the section.
pub fn get_count(&self) -> u32 {
self.count
}
/// Reads content of the type section.
///
/// # Examples
/// ```
/// use wasmparser::ComponentTypeSectionReader;
/// let data: &[u8] = &[0x01, 0x4c, 0x01, 0x01, 0x03, b'f', b'o', b'o', 0x72, 0x72];
/// let mut reader = ComponentTypeSectionReader::new(data, 0).unwrap();
/// for _ in 0..reader.get_count() {
/// let ty = reader.read().expect("type");
/// println!("Type {:?}", ty);
/// }
/// ```
pub fn read(&mut self) -> Result<ComponentTypeDef<'a>> {
self.reader.read_component_type_def()
}
}
impl<'a> SectionReader for ComponentTypeSectionReader<'a> {
type Item = ComponentTypeDef<'a>;
fn read(&mut self) -> Result<Self::Item> {
Self::read(self)
}
fn eof(&self) -> bool {
self.reader.eof()
}
fn original_position(&self) -> usize {
Self::original_position(self)
}
fn range(&self) -> Range<usize> {
self.reader.range()
}
}
impl<'a> SectionWithLimitedItems for ComponentTypeSectionReader<'a> {
fn get_count(&self) -> u32 {
Self::get_count(self)
}
}
impl<'a> IntoIterator for ComponentTypeSectionReader<'a> {
type Item = Result<ComponentTypeDef<'a>>;
type IntoIter = SectionIteratorLimited<Self>;
/// Implements iterator over the type section.
///
/// # Examples
/// ```
/// use wasmparser::ComponentTypeSectionReader;
/// # let data: &[u8] = &[0x01, 0x4c, 0x01, 0x01, 0x03, b'f', b'o', b'o', 0x72, 0x72];
/// let mut reader = ComponentTypeSectionReader::new(data, 0).unwrap();
/// for ty in reader {
/// println!("Type {:?}", ty.expect("type"));
/// }
/// ```
fn into_iter(self) -> Self::IntoIter {
SectionIteratorLimited::new(self)
}
}