use crate::{
limits::*, BinaryReaderError, Encoding, FunctionBody, Parser, Payload, Result, SectionReader,
SectionWithLimitedItems, ValType, WASM_COMPONENT_VERSION, WASM_MODULE_VERSION,
};
use ::alloc::sync::Arc;
use ::alloc::vec::Vec;
use ::core::mem;
use ::core::ops::Range;
pub fn validate(bytes: &[u8]) -> Result<Types> {
Validator::new().validate_all(bytes)
}
#[test]
fn test_validate() {
assert!(validate(&[0x0, 0x61, 0x73, 0x6d, 0x1, 0x0, 0x0, 0x0]).is_ok());
assert!(validate(&[0x0, 0x61, 0x73, 0x6d, 0x2, 0x0, 0x0, 0x0]).is_err());
}
mod component;
mod core;
mod func;
mod operators;
pub mod types;
use self::component::*;
pub use self::core::ValidatorResources;
use self::core::*;
use self::types::{TypeList, Types, TypesRef};
pub use func::{FuncToValidate, FuncValidator, FuncValidatorAllocations};
pub use operators::{Frame, FrameKind};
fn check_max(cur_len: usize, amt_added: u32, max: usize, desc: &str, offset: usize) -> Result<()> {
if max
.checked_sub(cur_len)
.and_then(|amt| amt.checked_sub(amt_added as usize))
.is_none()
{
if max == 1 {
bail!(offset, "multiple {desc}");
}
bail!(offset, "{desc} count exceeds limit of {max}");
}
Ok(())
}
fn combine_type_sizes(a: usize, b: usize, offset: usize) -> Result<usize> {
match a.checked_add(b) {
Some(sum) if sum < MAX_WASM_TYPE_SIZE => Ok(sum),
_ => Err(format_err!(
offset,
"effective type size exceeds the limit of {MAX_WASM_TYPE_SIZE}",
)),
}
}
#[derive(Default)]
pub struct Validator {
state: State,
types: TypeList,
module: Option<ModuleState>,
components: Vec<ComponentState>,
features: WasmFeatures,
}
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
enum State {
Unparsed(Option<Encoding>),
Module,
Component,
End,
}
impl State {
fn ensure_parsable(&self, offset: usize) -> Result<()> {
match self {
Self::Module | Self::Component => Ok(()),
Self::Unparsed(_) => Err(BinaryReaderError::new(
"unexpected section before header was parsed",
offset,
)),
Self::End => Err(BinaryReaderError::new(
"unexpected section after parsing has completed",
offset,
)),
}
}
fn ensure_module(&self, section: &str, offset: usize) -> Result<()> {
self.ensure_parsable(offset)?;
match self {
Self::Module => Ok(()),
Self::Component => Err(format_err!(
offset,
"unexpected module {section} section while parsing a component",
)),
_ => unreachable!(),
}
}
fn ensure_component(&self, section: &str, offset: usize) -> Result<()> {
self.ensure_parsable(offset)?;
match self {
Self::Component => Ok(()),
Self::Module => Err(format_err!(
offset,
"unexpected component {section} section while parsing a module",
)),
_ => unreachable!(),
}
}
}
impl Default for State {
fn default() -> Self {
Self::Unparsed(None)
}
}
#[derive(Hash, Debug, Copy, Clone)]
pub struct WasmFeatures {
pub mutable_global: bool,
pub saturating_float_to_int: bool,
pub sign_extension: bool,
pub reference_types: bool,
pub multi_value: bool,
pub bulk_memory: bool,
pub simd: bool,
pub relaxed_simd: bool,
pub threads: bool,
pub tail_call: bool,
pub deterministic_only: bool,
pub multi_memory: bool,
pub exceptions: bool,
pub memory64: bool,
pub extended_const: bool,
pub component_model: bool,
}
impl WasmFeatures {
pub(crate) fn check_value_type(&self, ty: ValType) -> Result<(), &'static str> {
match ty {
ValType::I32 | ValType::I64 | ValType::F32 | ValType::F64 => Ok(()),
ValType::FuncRef | ValType::ExternRef => {
if self.reference_types {
Ok(())
} else {
Err("reference types support is not enabled")
}
}
ValType::V128 => {
if self.simd {
Ok(())
} else {
Err("SIMD support is not enabled")
}
}
}
}
}
impl Default for WasmFeatures {
fn default() -> WasmFeatures {
WasmFeatures {
relaxed_simd: false,
threads: false,
tail_call: false,
multi_memory: false,
exceptions: false,
memory64: false,
extended_const: false,
component_model: false,
deterministic_only: cfg!(feature = "deterministic"),
mutable_global: true,
saturating_float_to_int: true,
sign_extension: true,
bulk_memory: true,
multi_value: true,
reference_types: true,
simd: true,
}
}
}
#[allow(clippy::large_enum_variant)]
pub enum ValidPayload<'a> {
Ok,
Parser(Parser),
Func(FuncToValidate<ValidatorResources>, FunctionBody<'a>),
End(Types),
}
impl Validator {
pub fn new() -> Validator {
Validator::default()
}
pub fn new_with_features(features: WasmFeatures) -> Validator {
let mut ret = Validator::new();
ret.features = features;
ret
}
pub fn features(&self) -> &WasmFeatures {
&self.features
}
pub fn validate_all(&mut self, bytes: &[u8]) -> Result<Types> {
let mut functions_to_validate = Vec::new();
let mut last_types = None;
for payload in Parser::new(0).parse_all(bytes) {
match self.payload(&payload?)? {
ValidPayload::Func(a, b) => {
functions_to_validate.push((a, b));
}
ValidPayload::End(types) => {
last_types = Some(types);
}
_ => {}
}
}
let mut allocs = FuncValidatorAllocations::default();
for (func, body) in functions_to_validate {
let mut validator = func.into_validator(allocs);
validator.validate(&body)?;
allocs = validator.into_allocations();
}
Ok(last_types.unwrap())
}
pub fn types(&self, mut level: usize) -> Option<TypesRef> {
if let Some(module) = &self.module {
if level == 0 {
return Some(TypesRef::from_module(&self.types, &module.module));
} else {
level -= 1;
}
}
self.components
.iter()
.nth_back(level)
.map(|component| TypesRef::from_component(&self.types, component))
}
pub fn payload<'a>(&mut self, payload: &Payload<'a>) -> Result<ValidPayload<'a>> {
use crate::Payload::*;
match payload {
Version {
num,
encoding,
range,
} => self.version(*num, *encoding, range)?,
TypeSection(s) => self.type_section(s)?,
ImportSection(s) => self.import_section(s)?,
FunctionSection(s) => self.function_section(s)?,
TableSection(s) => self.table_section(s)?,
MemorySection(s) => self.memory_section(s)?,
TagSection(s) => self.tag_section(s)?,
GlobalSection(s) => self.global_section(s)?,
ExportSection(s) => self.export_section(s)?,
StartSection { func, range } => self.start_section(*func, range)?,
ElementSection(s) => self.element_section(s)?,
DataCountSection { count, range } => self.data_count_section(*count, range)?,
CodeSectionStart {
count,
range,
size: _,
} => self.code_section_start(*count, range)?,
CodeSectionEntry(body) => {
let func_validator = self.code_section_entry(body)?;
return Ok(ValidPayload::Func(func_validator, *body));
}
DataSection(s) => self.data_section(s)?,
ModuleSection { parser, range, .. } => {
self.module_section(range)?;
return Ok(ValidPayload::Parser(parser.clone()));
}
InstanceSection(s) => self.instance_section(s)?,
CoreTypeSection(s) => self.core_type_section(s)?,
ComponentSection { parser, range, .. } => {
self.component_section(range)?;
return Ok(ValidPayload::Parser(parser.clone()));
}
ComponentInstanceSection(s) => self.component_instance_section(s)?,
ComponentAliasSection(s) => self.component_alias_section(s)?,
ComponentTypeSection(s) => self.component_type_section(s)?,
ComponentCanonicalSection(s) => self.component_canonical_section(s)?,
ComponentStartSection(s) => self.component_start_section(s)?,
ComponentImportSection(s) => self.component_import_section(s)?,
ComponentExportSection(s) => self.component_export_section(s)?,
End(offset) => return Ok(ValidPayload::End(self.end(*offset)?)),
CustomSection { .. } => {} UnknownSection { id, range, .. } => self.unknown_section(*id, range)?,
}
Ok(ValidPayload::Ok)
}
pub fn version(&mut self, num: u32, encoding: Encoding, range: &Range<usize>) -> Result<()> {
match &self.state {
State::Unparsed(expected) => {
if let Some(expected) = expected {
if *expected != encoding {
bail!(
range.start,
"expected a version header for a {}",
match expected {
Encoding::Module => "module",
Encoding::Component => "component",
}
);
}
}
}
_ => {
return Err(BinaryReaderError::new(
"wasm version header out of order",
range.start,
))
}
}
self.state = match (encoding, num) {
(Encoding::Module, WASM_MODULE_VERSION) => {
assert!(self.module.is_none());
self.module = Some(ModuleState::default());
State::Module
}
(Encoding::Component, WASM_COMPONENT_VERSION) => {
if !self.features.component_model {
return Err(BinaryReaderError::new(
"WebAssembly component model feature not enabled",
range.start,
));
}
self.components.push(ComponentState::default());
State::Component
}
_ => {
return Err(BinaryReaderError::new(
"unknown binary version",
range.start,
));
}
};
Ok(())
}
pub fn type_section(&mut self, section: &crate::TypeSectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Type,
section,
"type",
|state, _, types, count, offset| {
check_max(
state.module.types.len(),
count,
MAX_WASM_TYPES,
"types",
offset,
)?;
types.reserve(count as usize);
state.module.assert_mut().types.reserve(count as usize);
Ok(())
},
|state, features, types, def, offset| {
state
.module
.assert_mut()
.add_type(def, features, types, offset, false )
},
)
}
pub fn import_section(&mut self, section: &crate::ImportSectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Import,
section,
"import",
|_, _, _, _, _| Ok(()), |state, features, types, import, offset| {
state
.module
.assert_mut()
.add_import(import, features, types, offset)
},
)
}
pub fn function_section(&mut self, section: &crate::FunctionSectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Function,
section,
"function",
|state, _, _, count, offset| {
check_max(
state.module.functions.len(),
count,
MAX_WASM_FUNCTIONS,
"functions",
offset,
)?;
state.module.assert_mut().functions.reserve(count as usize);
debug_assert!(state.expected_code_bodies.is_none());
state.expected_code_bodies = Some(count);
Ok(())
},
|state, _, types, ty, offset| state.module.assert_mut().add_function(ty, types, offset),
)
}
pub fn table_section(&mut self, section: &crate::TableSectionReader<'_>) -> Result<()> {
let features = self.features;
self.process_module_section(
Order::Table,
section,
"table",
|state, _, _, count, offset| {
check_max(
state.module.tables.len(),
count,
state.module.max_tables(&features),
"tables",
offset,
)?;
state.module.assert_mut().tables.reserve(count as usize);
Ok(())
},
|state, features, _, ty, offset| {
state.module.assert_mut().add_table(ty, features, offset)
},
)
}
pub fn memory_section(&mut self, section: &crate::MemorySectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Memory,
section,
"memory",
|state, features, _, count, offset| {
check_max(
state.module.memories.len(),
count,
state.module.max_memories(features),
"memories",
offset,
)?;
state.module.assert_mut().memories.reserve(count as usize);
Ok(())
},
|state, features, _, ty, offset| {
state.module.assert_mut().add_memory(ty, features, offset)
},
)
}
pub fn tag_section(&mut self, section: &crate::TagSectionReader<'_>) -> Result<()> {
if !self.features.exceptions {
return Err(BinaryReaderError::new(
"exceptions proposal not enabled",
section.range().start,
));
}
self.process_module_section(
Order::Tag,
section,
"tag",
|state, _, _, count, offset| {
check_max(
state.module.tags.len(),
count,
MAX_WASM_TAGS,
"tags",
offset,
)?;
state.module.assert_mut().tags.reserve(count as usize);
Ok(())
},
|state, features, types, ty, offset| {
state
.module
.assert_mut()
.add_tag(ty, features, types, offset)
},
)
}
pub fn global_section(&mut self, section: &crate::GlobalSectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Global,
section,
"global",
|state, _, _, count, offset| {
check_max(
state.module.globals.len(),
count,
MAX_WASM_GLOBALS,
"globals",
offset,
)?;
state.module.assert_mut().globals.reserve(count as usize);
Ok(())
},
|state, features, types, global, offset| {
state.add_global(global, features, types, offset)
},
)
}
pub fn export_section(&mut self, section: &crate::ExportSectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Export,
section,
"export",
|state, _, _, count, offset| {
check_max(
state.module.exports.len(),
count,
MAX_WASM_EXPORTS,
"exports",
offset,
)?;
state.module.assert_mut().exports.reserve(count as usize);
Ok(())
},
|state, features, _, e, offset| {
let state = state.module.assert_mut();
let ty = state.export_to_entity_type(&e, offset)?;
state.add_export(e.name, ty, features, offset, false )
},
)
}
pub fn start_section(&mut self, func: u32, range: &Range<usize>) -> Result<()> {
let offset = range.start;
self.state.ensure_module("start", offset)?;
let state = self.module.as_mut().unwrap();
state.update_order(Order::Start, offset)?;
let ty = state.module.get_func_type(func, &self.types, offset)?;
if !ty.params().is_empty() || !ty.results().is_empty() {
return Err(BinaryReaderError::new(
"invalid start function type",
offset,
));
}
Ok(())
}
pub fn element_section(&mut self, section: &crate::ElementSectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Element,
section,
"element",
|state, _, _, count, offset| {
check_max(
state.module.element_types.len(),
count,
MAX_WASM_ELEMENT_SEGMENTS,
"element segments",
offset,
)?;
state
.module
.assert_mut()
.element_types
.reserve(count as usize);
Ok(())
},
|state, features, types, e, offset| {
state.add_element_segment(e, features, types, offset)
},
)
}
pub fn data_count_section(&mut self, count: u32, range: &Range<usize>) -> Result<()> {
let offset = range.start;
self.state.ensure_module("data count", offset)?;
let state = self.module.as_mut().unwrap();
state.update_order(Order::DataCount, offset)?;
if count > MAX_WASM_DATA_SEGMENTS as u32 {
return Err(BinaryReaderError::new(
"data count section specifies too many data segments",
offset,
));
}
state.module.assert_mut().data_count = Some(count);
Ok(())
}
pub fn code_section_start(&mut self, count: u32, range: &Range<usize>) -> Result<()> {
let offset = range.start;
self.state.ensure_module("code", offset)?;
let state = self.module.as_mut().unwrap();
state.update_order(Order::Code, offset)?;
match state.expected_code_bodies.take() {
Some(n) if n == count => {}
Some(_) => {
return Err(BinaryReaderError::new(
"function and code section have inconsistent lengths",
offset,
));
}
None if count == 0 => {}
None => {
return Err(BinaryReaderError::new(
"code section without function section",
offset,
))
}
}
state.module.assert_mut().snapshot = Some(Arc::new(self.types.commit()));
Ok(())
}
pub fn code_section_entry(
&mut self,
body: &crate::FunctionBody,
) -> Result<FuncToValidate<ValidatorResources>> {
let offset = body.range().start;
self.state.ensure_module("code", offset)?;
let state = self.module.as_mut().unwrap();
let (index, ty) = state.next_code_index_and_type(offset)?;
Ok(FuncToValidate::new(
index,
ty,
ValidatorResources(state.module.arc().clone()),
&self.features,
))
}
pub fn data_section(&mut self, section: &crate::DataSectionReader<'_>) -> Result<()> {
self.process_module_section(
Order::Data,
section,
"data",
|state, _, _, count, offset| {
state.data_segment_count = count;
check_max(0, count, MAX_WASM_DATA_SEGMENTS, "data segments", offset)
},
|state, features, types, d, offset| state.add_data_segment(d, features, types, offset),
)
}
pub fn module_section(&mut self, range: &Range<usize>) -> Result<()> {
self.state.ensure_component("module", range.start)?;
let current = self.components.last_mut().unwrap();
check_max(
current.core_modules.len(),
1,
MAX_WASM_MODULES,
"modules",
range.start,
)?;
match mem::replace(&mut self.state, State::Unparsed(Some(Encoding::Module))) {
State::Component => {}
_ => unreachable!(),
}
Ok(())
}
pub fn instance_section(&mut self, section: &crate::InstanceSectionReader) -> Result<()> {
self.process_component_section(
section,
"core instance",
|components, _, count, offset| {
let current = components.last_mut().unwrap();
check_max(
current.instance_count(),
count,
MAX_WASM_INSTANCES,
"instances",
offset,
)?;
current.core_instances.reserve(count as usize);
Ok(())
},
|components, types, _, instance, offset| {
components
.last_mut()
.unwrap()
.add_core_instance(instance, types, offset)
},
)
}
pub fn core_type_section(&mut self, section: &crate::CoreTypeSectionReader<'_>) -> Result<()> {
self.process_component_section(
section,
"core type",
|components, types, count, offset| {
let current = components.last_mut().unwrap();
check_max(current.type_count(), count, MAX_WASM_TYPES, "types", offset)?;
types.reserve(count as usize);
current.core_types.reserve(count as usize);
Ok(())
},
|components, types, features, ty, offset| {
ComponentState::add_core_type(
components, ty, features, types, offset, false,
)
},
)
}
pub fn component_section(&mut self, range: &Range<usize>) -> Result<()> {
self.state.ensure_component("component", range.start)?;
let current = self.components.last_mut().unwrap();
check_max(
current.components.len(),
1,
MAX_WASM_COMPONENTS,
"components",
range.start,
)?;
match mem::replace(&mut self.state, State::Unparsed(Some(Encoding::Component))) {
State::Component => {}
_ => unreachable!(),
}
Ok(())
}
pub fn component_instance_section(
&mut self,
section: &crate::ComponentInstanceSectionReader,
) -> Result<()> {
self.process_component_section(
section,
"instance",
|components, _, count, offset| {
let current = components.last_mut().unwrap();
check_max(
current.instance_count(),
count,
MAX_WASM_INSTANCES,
"instances",
offset,
)?;
current.instances.reserve(count as usize);
Ok(())
},
|components, types, _, instance, offset| {
components
.last_mut()
.unwrap()
.add_instance(instance, types, offset)
},
)
}
pub fn component_alias_section(
&mut self,
section: &crate::ComponentAliasSectionReader,
) -> Result<()> {
self.process_component_section(
section,
"alias",
|_, _, _, _| Ok(()), |components, types, _, alias, offset| -> Result<(), BinaryReaderError> {
ComponentState::add_alias(components, alias, types, offset)
},
)
}
pub fn component_type_section(
&mut self,
section: &crate::ComponentTypeSectionReader,
) -> Result<()> {
self.process_component_section(
section,
"type",
|components, types, count, offset| {
let current = components.last_mut().unwrap();
check_max(current.type_count(), count, MAX_WASM_TYPES, "types", offset)?;
types.reserve(count as usize);
current.types.reserve(count as usize);
Ok(())
},
|components, types, features, ty, offset| {
ComponentState::add_type(
components, ty, features, types, offset, false,
)
},
)
}
pub fn component_canonical_section(
&mut self,
section: &crate::ComponentCanonicalSectionReader,
) -> Result<()> {
self.process_component_section(
section,
"function",
|components, _, count, offset| {
let current = components.last_mut().unwrap();
check_max(
current.function_count(),
count,
MAX_WASM_FUNCTIONS,
"functions",
offset,
)?;
current.funcs.reserve(count as usize);
Ok(())
},
|components, types, _, func, offset| {
let current = components.last_mut().unwrap();
match func {
crate::CanonicalFunction::Lift {
core_func_index,
type_index,
options,
} => current.lift_function(
core_func_index,
type_index,
options.into_vec(),
types,
offset,
),
crate::CanonicalFunction::Lower {
func_index,
options,
} => current.lower_function(func_index, options.into_vec(), types, offset),
}
},
)
}
pub fn component_start_section(
&mut self,
section: &crate::ComponentStartSectionReader,
) -> Result<()> {
let range = section.range();
self.state.ensure_component("start", range.start)?;
let mut section = section.clone();
let f = section.read()?;
if !section.eof() {
return Err(BinaryReaderError::new(
"trailing data at the end of the start section",
section.original_position(),
));
}
self.components.last_mut().unwrap().add_start(
f.func_index,
&f.arguments,
f.results,
&self.types,
range.start,
)
}
pub fn component_import_section(
&mut self,
section: &crate::ComponentImportSectionReader,
) -> Result<()> {
self.process_component_section(
section,
"import",
|_, _, _, _| Ok(()), |components, types, _, import, offset| {
components
.last_mut()
.unwrap()
.add_import(import, types, offset)
},
)
}
pub fn component_export_section(
&mut self,
section: &crate::ComponentExportSectionReader,
) -> Result<()> {
self.process_component_section(
section,
"export",
|components, _, count, offset| {
let current = components.last_mut().unwrap();
check_max(
current.exports.len(),
count,
MAX_WASM_EXPORTS,
"exports",
offset,
)?;
current.exports.reserve(count as usize);
Ok(())
},
|components, _, _, export, offset| {
let current = components.last_mut().unwrap();
let ty = current.export_to_entity_type(&export, offset)?;
current.add_export(export.name, ty, offset, false )
},
)
}
pub fn unknown_section(&mut self, id: u8, range: &Range<usize>) -> Result<()> {
Err(format_err!(range.start, "malformed section id: {id}"))
}
pub fn end(&mut self, offset: usize) -> Result<Types> {
match ::core::mem::replace(&mut self.state, State::End) {
State::Unparsed(_) => Err(BinaryReaderError::new(
"cannot call `end` before a header has been parsed",
offset,
)),
State::End => Err(BinaryReaderError::new(
"cannot call `end` after parsing has completed",
offset,
)),
State::Module => {
let mut state = self.module.take().unwrap();
state.validate_end(offset)?;
if let Some(parent) = self.components.last_mut() {
parent.add_core_module(&state.module, &mut self.types, offset)?;
self.state = State::Component;
}
Ok(Types::from_module(
self.types.commit(),
state.module.arc().clone(),
))
}
State::Component => {
let mut component = self.components.pop().unwrap();
if let Some(index) = component.values.iter().position(|(_, used)| !*used) {
return Err(
format_err!(offset,"value index {index} was not used as part of an instantiation, start function, or export"
)
);
}
if let Some(parent) = self.components.last_mut() {
parent.add_component(&mut component, &mut self.types);
self.state = State::Component;
}
Ok(Types::from_component(self.types.commit(), component))
}
}
}
fn process_module_section<T>(
&mut self,
order: Order,
section: &T,
name: &str,
validate_section: impl FnOnce(
&mut ModuleState,
&WasmFeatures,
&mut TypeList,
u32,
usize,
) -> Result<()>,
mut validate_item: impl FnMut(
&mut ModuleState,
&WasmFeatures,
&mut TypeList,
T::Item,
usize,
) -> Result<()>,
) -> Result<()>
where
T: SectionReader + Clone + SectionWithLimitedItems,
{
let offset = section.range().start;
self.state.ensure_module(name, offset)?;
let state = self.module.as_mut().unwrap();
state.update_order(order, offset)?;
validate_section(
state,
&self.features,
&mut self.types,
section.get_count(),
offset,
)?;
let mut section = section.clone();
for _ in 0..section.get_count() {
let offset = section.original_position();
let item = section.read()?;
validate_item(state, &self.features, &mut self.types, item, offset)?;
}
section.ensure_end()?;
Ok(())
}
fn process_component_section<T>(
&mut self,
section: &T,
name: &str,
validate_section: impl FnOnce(&mut Vec<ComponentState>, &mut TypeList, u32, usize) -> Result<()>,
mut validate_item: impl FnMut(
&mut Vec<ComponentState>,
&mut TypeList,
&WasmFeatures,
T::Item,
usize,
) -> Result<()>,
) -> Result<()>
where
T: Clone + SectionWithLimitedItems,
{
let offset = section.range().start;
if !self.features.component_model {
return Err(BinaryReaderError::new(
"component model feature is not enabled",
offset,
));
}
self.state.ensure_component(name, offset)?;
validate_section(
&mut self.components,
&mut self.types,
section.get_count(),
offset,
)?;
let mut section = section.clone();
for _ in 0..section.get_count() {
let offset = section.original_position();
let item = section.read()?;
validate_item(
&mut self.components,
&mut self.types,
&self.features,
item,
offset,
)?;
}
section.ensure_end()?;
Ok(())
}
}
#[cfg(test)]
mod tests {
use crate::{GlobalType, MemoryType, TableType, ValType, Validator, WasmFeatures};
use anyhow::Result;
#[test]
fn test_module_type_information() -> Result<()> {
let bytes = wat::parse_str(
r#"
(module
(type (func (param i32 i64) (result i32)))
(memory 1 5)
(table 10 funcref)
(global (mut i32) (i32.const 0))
(func (type 0) (i32.const 0))
(tag (param i64 i32))
(elem funcref (ref.func 0))
)
"#,
)?;
let mut validator = Validator::new_with_features(WasmFeatures {
exceptions: true,
..Default::default()
});
let types = validator.validate_all(&bytes)?;
assert_eq!(types.type_count(), 2);
assert_eq!(types.memory_count(), 1);
assert_eq!(types.table_count(), 1);
assert_eq!(types.global_count(), 1);
assert_eq!(types.function_count(), 1);
assert_eq!(types.tag_count(), 1);
assert_eq!(types.element_count(), 1);
assert_eq!(types.module_count(), 0);
assert_eq!(types.component_count(), 0);
assert_eq!(types.instance_count(), 0);
assert_eq!(types.value_count(), 0);
match types.func_type_at(0) {
Some(ty) => {
assert_eq!(ty.params(), [ValType::I32, ValType::I64]);
assert_eq!(ty.results(), [ValType::I32]);
}
_ => unreachable!(),
}
match types.func_type_at(1) {
Some(ty) => {
assert_eq!(ty.params(), [ValType::I64, ValType::I32]);
assert_eq!(ty.results(), []);
}
_ => unreachable!(),
}
assert_eq!(
types.memory_at(0),
Some(MemoryType {
memory64: false,
shared: false,
initial: 1,
maximum: Some(5)
})
);
assert_eq!(
types.table_at(0),
Some(TableType {
initial: 10,
maximum: None,
element_type: ValType::FuncRef,
})
);
assert_eq!(
types.global_at(0),
Some(GlobalType {
content_type: ValType::I32,
mutable: true
})
);
match types.function_at(0) {
Some(ty) => {
assert_eq!(ty.params(), [ValType::I32, ValType::I64]);
assert_eq!(ty.results(), [ValType::I32]);
}
_ => unreachable!(),
}
match types.tag_at(0) {
Some(ty) => {
assert_eq!(ty.params(), [ValType::I64, ValType::I32]);
assert_eq!(ty.results(), []);
}
_ => unreachable!(),
}
assert_eq!(types.element_at(0), Some(ValType::FuncRef));
Ok(())
}
}