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diff --git a/third_party/rust/wasm-smith/src/component.rs b/third_party/rust/wasm-smith/src/component.rs
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+//! Generation of Wasm
+//! [components](https://github.com/WebAssembly/component-model).
+
+// FIXME(#1000): component support in `wasm-smith` is a work in progress.
+#![allow(unused_variables, dead_code)]
+
+use crate::{arbitrary_loop, Config};
+use arbitrary::{Arbitrary, Result, Unstructured};
+use std::collections::BTreeMap;
+use std::convert::TryFrom;
+use std::{
+ collections::{HashMap, HashSet},
+ rc::Rc,
+};
+use wasm_encoder::{ComponentTypeRef, ComponentValType, PrimitiveValType, TypeBounds, ValType};
+
+mod encode;
+
+/// A pseudo-random WebAssembly [component].
+///
+/// Construct instances of this type with [the `Arbitrary`
+/// trait](https://docs.rs/arbitrary/*/arbitrary/trait.Arbitrary.html).
+///
+/// [component]: https://github.com/WebAssembly/component-model/blob/ast-and-binary/design/MVP/Explainer.md
+///
+/// ## Configured Generated Components
+///
+/// The `Arbitrary` implementation uses the [`Config::default()`][crate::Config]
+/// configuration. If you want to customize the shape of generated components,
+/// create your own [`Config`][crate::Config] instance and pass it to
+/// [`Component::new`][crate::Component::new].
+#[derive(Debug)]
+pub struct Component {
+ sections: Vec<Section>,
+}
+
+/// A builder to create a component (and possibly a whole tree of nested
+/// components).
+///
+/// Maintains a stack of components we are currently building, as well as
+/// metadata about them. The split between `Component` and `ComponentBuilder` is
+/// that the builder contains metadata that is purely used when generating
+/// components and is unnecessary after we are done generating the structure of
+/// the components and only need to encode an already-generated component to
+/// bytes.
+#[derive(Debug)]
+struct ComponentBuilder {
+ config: Config,
+
+ // The set of core `valtype`s that we are configured to generate.
+ core_valtypes: Vec<ValType>,
+
+ // Stack of types scopes that are currently available.
+ //
+ // There is an entry in this stack for each component, but there can also be
+ // additional entries for module/component/instance types, each of which
+ // have their own scope.
+ //
+ // This stack is always non-empty and the last entry is always the current
+ // scope.
+ //
+ // When a particular scope can alias outer types, it can alias from any
+ // scope that is older than it (i.e. `types_scope[i]` can alias from
+ // `types_scope[j]` when `j <= i`).
+ types: Vec<TypesScope>,
+
+ // The set of components we are currently building and their associated
+ // metadata.
+ components: Vec<ComponentContext>,
+
+ // Whether we are in the final bits of generating this component and we just
+ // need to ensure that the minimum number of entities configured have all
+ // been generated. This changes the behavior of various
+ // `arbitrary_<section>` methods to always fill in their minimums.
+ fill_minimums: bool,
+
+ // Our maximums for these entities are applied across the whole component
+ // tree, not per-component.
+ total_components: usize,
+ total_modules: usize,
+ total_instances: usize,
+ total_values: usize,
+}
+
+#[derive(Debug, Clone)]
+enum ComponentOrCoreFuncType {
+ Component(Rc<FuncType>),
+ Core(Rc<crate::core::FuncType>),
+}
+
+impl ComponentOrCoreFuncType {
+ fn as_core(&self) -> &Rc<crate::core::FuncType> {
+ match self {
+ ComponentOrCoreFuncType::Core(t) => t,
+ ComponentOrCoreFuncType::Component(_) => panic!("not a core func type"),
+ }
+ }
+
+ fn as_component(&self) -> &Rc<FuncType> {
+ match self {
+ ComponentOrCoreFuncType::Core(_) => panic!("not a component func type"),
+ ComponentOrCoreFuncType::Component(t) => t,
+ }
+ }
+}
+
+#[derive(Debug, Clone)]
+enum ComponentOrCoreInstanceType {
+ Component(Rc<InstanceType>),
+ Core(BTreeMap<String, crate::core::EntityType>),
+}
+
+/// Metadata (e.g. contents of various index spaces) we keep track of on a
+/// per-component basis.
+#[derive(Debug)]
+struct ComponentContext {
+ // The actual component itself.
+ component: Component,
+
+ // The number of imports we have generated thus far.
+ num_imports: usize,
+
+ // The set of names of imports we've generated thus far.
+ import_names: HashSet<String>,
+
+ // The set of URLs of imports we've generated thus far.
+ import_urls: HashSet<String>,
+
+ // This component's function index space.
+ funcs: Vec<ComponentOrCoreFuncType>,
+
+ // Which entries in `funcs` are component functions?
+ component_funcs: Vec<u32>,
+
+ // Which entries in `component_funcs` are component functions that only use scalar
+ // types?
+ scalar_component_funcs: Vec<u32>,
+
+ // Which entries in `funcs` are core Wasm functions?
+ //
+ // Note that a component can't import core functions, so these entries will
+ // never point to a `Section::Import`.
+ core_funcs: Vec<u32>,
+
+ // This component's component index space.
+ //
+ // An indirect list of all directly-nested (not transitive) components
+ // inside this component.
+ //
+ // Each entry is of the form `(i, j)` where `component.sections[i]` is
+ // guaranteed to be either
+ //
+ // * a `Section::Component` and we are referencing the component defined in
+ // that section (in this case `j` must also be `0`, since a component
+ // section can only contain a single nested component), or
+ //
+ // * a `Section::Import` and we are referencing the `j`th import in that
+ // section, which is guaranteed to be a component import.
+ components: Vec<(usize, usize)>,
+
+ // This component's module index space.
+ //
+ // An indirect list of all directly-nested (not transitive) modules
+ // inside this component.
+ //
+ // Each entry is of the form `(i, j)` where `component.sections[i]` is
+ // guaranteed to be either
+ //
+ // * a `Section::Core` and we are referencing the module defined in that
+ // section (in this case `j` must also be `0`, since a core section can
+ // only contain a single nested module), or
+ //
+ // * a `Section::Import` and we are referencing the `j`th import in that
+ // section, which is guaranteed to be a module import.
+ modules: Vec<(usize, usize)>,
+
+ // This component's instance index space.
+ instances: Vec<ComponentOrCoreInstanceType>,
+
+ // This component's value index space.
+ values: Vec<ComponentValType>,
+}
+
+impl ComponentContext {
+ fn empty() -> Self {
+ ComponentContext {
+ component: Component::empty(),
+ num_imports: 0,
+ import_names: HashSet::default(),
+ import_urls: HashSet::default(),
+ funcs: vec![],
+ component_funcs: vec![],
+ scalar_component_funcs: vec![],
+ core_funcs: vec![],
+ components: vec![],
+ modules: vec![],
+ instances: vec![],
+ values: vec![],
+ }
+ }
+
+ fn num_modules(&self) -> usize {
+ self.modules.len()
+ }
+
+ fn num_components(&self) -> usize {
+ self.components.len()
+ }
+
+ fn num_instances(&self) -> usize {
+ self.instances.len()
+ }
+
+ fn num_funcs(&self) -> usize {
+ self.funcs.len()
+ }
+
+ fn num_values(&self) -> usize {
+ self.values.len()
+ }
+}
+
+#[derive(Debug, Default)]
+struct TypesScope {
+ // All core types in this scope, regardless of kind.
+ core_types: Vec<Rc<CoreType>>,
+
+ // The indices of all the entries in `core_types` that are core function types.
+ core_func_types: Vec<u32>,
+
+ // The indices of all the entries in `core_types` that are module types.
+ module_types: Vec<u32>,
+
+ // All component types in this index space, regardless of kind.
+ types: Vec<Rc<Type>>,
+
+ // The indices of all the entries in `types` that are defined value types.
+ defined_types: Vec<u32>,
+
+ // The indices of all the entries in `types` that are func types.
+ func_types: Vec<u32>,
+
+ // A map from function types to their indices in the types space.
+ func_type_to_indices: HashMap<Rc<FuncType>, Vec<u32>>,
+
+ // The indices of all the entries in `types` that are component types.
+ component_types: Vec<u32>,
+
+ // The indices of all the entries in `types` that are instance types.
+ instance_types: Vec<u32>,
+}
+
+impl TypesScope {
+ fn push(&mut self, ty: Rc<Type>) -> u32 {
+ let ty_idx = u32::try_from(self.types.len()).unwrap();
+
+ let kind_list = match &*ty {
+ Type::Defined(_) => &mut self.defined_types,
+ Type::Func(func_ty) => {
+ self.func_type_to_indices
+ .entry(func_ty.clone())
+ .or_default()
+ .push(ty_idx);
+ &mut self.func_types
+ }
+ Type::Component(_) => &mut self.component_types,
+ Type::Instance(_) => &mut self.instance_types,
+ };
+ kind_list.push(ty_idx);
+
+ self.types.push(ty);
+ ty_idx
+ }
+
+ fn push_core(&mut self, ty: Rc<CoreType>) -> u32 {
+ let ty_idx = u32::try_from(self.core_types.len()).unwrap();
+
+ let kind_list = match &*ty {
+ CoreType::Func(_) => &mut self.core_func_types,
+ CoreType::Module(_) => &mut self.module_types,
+ };
+ kind_list.push(ty_idx);
+
+ self.core_types.push(ty);
+ ty_idx
+ }
+
+ fn get(&self, index: u32) -> &Rc<Type> {
+ &self.types[index as usize]
+ }
+
+ fn get_core(&self, index: u32) -> &Rc<CoreType> {
+ &self.core_types[index as usize]
+ }
+
+ fn get_func(&self, index: u32) -> &Rc<FuncType> {
+ match &**self.get(index) {
+ Type::Func(f) => f,
+ _ => panic!("get_func on non-function type"),
+ }
+ }
+
+ fn can_ref_type(&self) -> bool {
+ // All component types and core module types may be referenced
+ !self.types.is_empty() || !self.module_types.is_empty()
+ }
+}
+
+impl<'a> Arbitrary<'a> for Component {
+ fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> {
+ Component::new(Config::default(), u)
+ }
+}
+
+#[derive(Default)]
+struct EntityCounts {
+ globals: usize,
+ tables: usize,
+ memories: usize,
+ tags: usize,
+ funcs: usize,
+}
+
+impl Component {
+ /// Construct a new `Component` using the given configuration.
+ pub fn new(config: Config, u: &mut Unstructured) -> Result<Self> {
+ let mut builder = ComponentBuilder::new(config);
+ builder.build(u)
+ }
+
+ fn empty() -> Self {
+ Component { sections: vec![] }
+ }
+}
+
+#[must_use]
+enum Step {
+ Finished(Component),
+ StillBuilding,
+}
+
+impl Step {
+ fn unwrap_still_building(self) {
+ match self {
+ Step::Finished(_) => panic!(
+ "`Step::unwrap_still_building` called on a `Step` that is not `StillBuilding`"
+ ),
+ Step::StillBuilding => {}
+ }
+ }
+}
+
+impl ComponentBuilder {
+ fn new(config: Config) -> Self {
+ ComponentBuilder {
+ config,
+ core_valtypes: vec![],
+ types: vec![Default::default()],
+ components: vec![ComponentContext::empty()],
+ fill_minimums: false,
+ total_components: 0,
+ total_modules: 0,
+ total_instances: 0,
+ total_values: 0,
+ }
+ }
+
+ fn build(&mut self, u: &mut Unstructured) -> Result<Component> {
+ self.core_valtypes = crate::core::configured_valtypes(&self.config);
+
+ let mut choices: Vec<fn(&mut ComponentBuilder, &mut Unstructured) -> Result<Step>> = vec![];
+
+ loop {
+ choices.clear();
+ choices.push(Self::finish_component);
+
+ // Only add any choice other than "finish what we've generated thus
+ // far" when there is more arbitrary fuzzer data for us to consume.
+ if !u.is_empty() {
+ choices.push(Self::arbitrary_custom_section);
+
+ // NB: we add each section as a choice even if we've already
+ // generated our maximum number of entities in that section so that
+ // we can exercise adding empty sections to the end of the module.
+ choices.push(Self::arbitrary_core_type_section);
+ choices.push(Self::arbitrary_type_section);
+ choices.push(Self::arbitrary_import_section);
+ choices.push(Self::arbitrary_canonical_section);
+
+ if self.total_modules < self.config.max_modules {
+ choices.push(Self::arbitrary_core_module_section);
+ }
+
+ if self.components.len() < self.config.max_nesting_depth
+ && self.total_components < self.config.max_components
+ {
+ choices.push(Self::arbitrary_component_section);
+ }
+
+ // FIXME(#1000)
+ //
+ // choices.push(Self::arbitrary_instance_section);
+ // choices.push(Self::arbitrary_export_section);
+ // choices.push(Self::arbitrary_start_section);
+ // choices.push(Self::arbitrary_alias_section);
+ }
+
+ let f = u.choose(&choices)?;
+ match f(self, u)? {
+ Step::StillBuilding => {}
+ Step::Finished(component) => {
+ if self.components.is_empty() {
+ // If we just finished the root component, then return it.
+ return Ok(component);
+ } else {
+ // Otherwise, add it as a nested component in the parent.
+ self.push_section(Section::Component(component));
+ }
+ }
+ }
+ }
+ }
+
+ fn finish_component(&mut self, u: &mut Unstructured) -> Result<Step> {
+ // Ensure we've generated all of our minimums.
+ self.fill_minimums = true;
+ {
+ if self.current_type_scope().types.len() < self.config.min_types {
+ self.arbitrary_type_section(u)?.unwrap_still_building();
+ }
+ if self.component().num_imports < self.config.min_imports {
+ self.arbitrary_import_section(u)?.unwrap_still_building();
+ }
+ if self.component().funcs.len() < self.config.min_funcs {
+ self.arbitrary_canonical_section(u)?.unwrap_still_building();
+ }
+ }
+ self.fill_minimums = false;
+
+ self.types
+ .pop()
+ .expect("should have a types scope for the component we are finishing");
+ Ok(Step::Finished(self.components.pop().unwrap().component))
+ }
+
+ fn component(&self) -> &ComponentContext {
+ self.components.last().unwrap()
+ }
+
+ fn component_mut(&mut self) -> &mut ComponentContext {
+ self.components.last_mut().unwrap()
+ }
+
+ fn last_section(&self) -> Option<&Section> {
+ self.component().component.sections.last()
+ }
+
+ fn last_section_mut(&mut self) -> Option<&mut Section> {
+ self.component_mut().component.sections.last_mut()
+ }
+
+ fn push_section(&mut self, section: Section) {
+ self.component_mut().component.sections.push(section);
+ }
+
+ fn ensure_section(
+ &mut self,
+ mut predicate: impl FnMut(&Section) -> bool,
+ mut make_section: impl FnMut() -> Section,
+ ) -> &mut Section {
+ match self.last_section() {
+ Some(sec) if predicate(sec) => {}
+ _ => self.push_section(make_section()),
+ }
+ self.last_section_mut().unwrap()
+ }
+
+ fn arbitrary_custom_section(&mut self, u: &mut Unstructured) -> Result<Step> {
+ self.push_section(Section::Custom(u.arbitrary()?));
+ Ok(Step::StillBuilding)
+ }
+
+ fn push_type(&mut self, ty: Rc<Type>) -> u32 {
+ match self.ensure_section(
+ |s| matches!(s, Section::Type(_)),
+ || Section::Type(TypeSection { types: vec![] }),
+ ) {
+ Section::Type(TypeSection { types }) => {
+ types.push(ty.clone());
+ self.current_type_scope_mut().push(ty)
+ }
+ _ => unreachable!(),
+ }
+ }
+
+ fn push_core_type(&mut self, ty: Rc<CoreType>) -> u32 {
+ match self.ensure_section(
+ |s| matches!(s, Section::CoreType(_)),
+ || Section::CoreType(CoreTypeSection { types: vec![] }),
+ ) {
+ Section::CoreType(CoreTypeSection { types }) => {
+ types.push(ty.clone());
+ self.current_type_scope_mut().push_core(ty)
+ }
+ _ => unreachable!(),
+ }
+ }
+
+ fn arbitrary_core_type_section(&mut self, u: &mut Unstructured) -> Result<Step> {
+ self.push_section(Section::CoreType(CoreTypeSection { types: vec![] }));
+
+ let min = if self.fill_minimums {
+ self.config
+ .min_types
+ .saturating_sub(self.current_type_scope().types.len())
+ } else {
+ 0
+ };
+
+ let max = self.config.max_types - self.current_type_scope().types.len();
+
+ arbitrary_loop(u, min, max, |u| {
+ let mut type_fuel = self.config.max_type_size;
+ let ty = self.arbitrary_core_type(u, &mut type_fuel)?;
+ self.push_core_type(ty);
+ Ok(true)
+ })?;
+
+ Ok(Step::StillBuilding)
+ }
+
+ fn arbitrary_core_type(
+ &self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<Rc<CoreType>> {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(Rc::new(CoreType::Module(Rc::new(ModuleType::default()))));
+ }
+
+ let ty = match u.int_in_range::<u8>(0..=1)? {
+ 0 => CoreType::Func(crate::core::arbitrary_func_type(
+ u,
+ &self.config,
+ &self.core_valtypes,
+ if self.config.multi_value_enabled {
+ None
+ } else {
+ Some(1)
+ },
+ 0,
+ )?),
+ 1 => CoreType::Module(self.arbitrary_module_type(u, type_fuel)?),
+ _ => unreachable!(),
+ };
+ Ok(Rc::new(ty))
+ }
+
+ fn arbitrary_type_section(&mut self, u: &mut Unstructured) -> Result<Step> {
+ self.push_section(Section::Type(TypeSection { types: vec![] }));
+
+ let min = if self.fill_minimums {
+ self.config
+ .min_types
+ .saturating_sub(self.current_type_scope().types.len())
+ } else {
+ 0
+ };
+
+ let max = self.config.max_types - self.current_type_scope().types.len();
+
+ arbitrary_loop(u, min, max, |u| {
+ let mut type_fuel = self.config.max_type_size;
+ let ty = self.arbitrary_type(u, &mut type_fuel)?;
+ self.push_type(ty);
+ Ok(true)
+ })?;
+
+ Ok(Step::StillBuilding)
+ }
+
+ fn arbitrary_type_ref<'a>(
+ &self,
+ u: &mut Unstructured<'a>,
+ for_import: bool,
+ for_type_def: bool,
+ ) -> Result<Option<ComponentTypeRef>> {
+ let mut choices: Vec<fn(&Self, &mut Unstructured) -> Result<ComponentTypeRef>> = Vec::new();
+ let scope = self.current_type_scope();
+
+ if !scope.module_types.is_empty()
+ && (for_type_def || !for_import || self.total_modules < self.config.max_modules)
+ {
+ choices.push(|me, u| {
+ Ok(ComponentTypeRef::Module(
+ *u.choose(&me.current_type_scope().module_types)?,
+ ))
+ });
+ }
+
+ // Types cannot be imported currently
+ if !for_import
+ && !scope.types.is_empty()
+ && (for_type_def || scope.types.len() < self.config.max_types)
+ {
+ choices.push(|me, u| {
+ Ok(ComponentTypeRef::Type(TypeBounds::Eq(u.int_in_range(
+ 0..=u32::try_from(me.current_type_scope().types.len() - 1).unwrap(),
+ )?)))
+ });
+ }
+
+ // TODO: wasm-smith needs to ensure that every arbitrary value gets used exactly once.
+ // until that time, don't import values
+ // if for_type_def || !for_import || self.total_values < self.config.max_values() {
+ // choices.push(|me, u| Ok(ComponentTypeRef::Value(me.arbitrary_component_val_type(u)?)));
+ // }
+
+ if !scope.func_types.is_empty()
+ && (for_type_def || !for_import || self.component().num_funcs() < self.config.max_funcs)
+ {
+ choices.push(|me, u| {
+ Ok(ComponentTypeRef::Func(
+ *u.choose(&me.current_type_scope().func_types)?,
+ ))
+ });
+ }
+
+ if !scope.component_types.is_empty()
+ && (for_type_def || !for_import || self.total_components < self.config.max_components)
+ {
+ choices.push(|me, u| {
+ Ok(ComponentTypeRef::Component(
+ *u.choose(&me.current_type_scope().component_types)?,
+ ))
+ });
+ }
+
+ if !scope.instance_types.is_empty()
+ && (for_type_def || !for_import || self.total_instances < self.config.max_instances)
+ {
+ choices.push(|me, u| {
+ Ok(ComponentTypeRef::Instance(
+ *u.choose(&me.current_type_scope().instance_types)?,
+ ))
+ });
+ }
+
+ if choices.is_empty() {
+ return Ok(None);
+ }
+
+ let f = u.choose(&choices)?;
+ f(self, u).map(Option::Some)
+ }
+
+ fn arbitrary_type(&mut self, u: &mut Unstructured, type_fuel: &mut u32) -> Result<Rc<Type>> {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(Rc::new(Type::Defined(
+ self.arbitrary_defined_type(u, type_fuel)?,
+ )));
+ }
+
+ let ty = match u.int_in_range::<u8>(0..=3)? {
+ 0 => Type::Defined(self.arbitrary_defined_type(u, type_fuel)?),
+ 1 => Type::Func(self.arbitrary_func_type(u, type_fuel)?),
+ 2 => Type::Component(self.arbitrary_component_type(u, type_fuel)?),
+ 3 => Type::Instance(self.arbitrary_instance_type(u, type_fuel)?),
+ _ => unreachable!(),
+ };
+ Ok(Rc::new(ty))
+ }
+
+ fn arbitrary_module_type(
+ &self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<Rc<ModuleType>> {
+ let mut defs = vec![];
+ let mut has_memory = false;
+ let mut has_canonical_abi_realloc = false;
+ let mut has_canonical_abi_free = false;
+ let mut types: Vec<Rc<crate::core::FuncType>> = vec![];
+ let mut imports = HashMap::new();
+ let mut exports = HashSet::new();
+ let mut counts = EntityCounts::default();
+
+ // Special case the canonical ABI functions since certain types can only
+ // be passed across the component boundary if they exist and
+ // randomly generating them is extremely unlikely.
+
+ // `memory`
+ if counts.memories < self.config.max_memories && u.ratio::<u8>(99, 100)? {
+ defs.push(ModuleTypeDef::Export(
+ "memory".into(),
+ crate::core::EntityType::Memory(self.arbitrary_core_memory_type(u)?),
+ ));
+ exports.insert("memory".into());
+ counts.memories += 1;
+ has_memory = true;
+ }
+
+ // `canonical_abi_realloc`
+ if counts.funcs < self.config.max_funcs
+ && types.len() < self.config.max_types
+ && u.ratio::<u8>(99, 100)?
+ {
+ let realloc_ty = Rc::new(crate::core::FuncType {
+ params: vec![ValType::I32, ValType::I32, ValType::I32, ValType::I32],
+ results: vec![ValType::I32],
+ });
+ let ty_idx = u32::try_from(types.len()).unwrap();
+ types.push(realloc_ty.clone());
+ defs.push(ModuleTypeDef::TypeDef(crate::core::CompositeType::Func(
+ realloc_ty.clone(),
+ )));
+ defs.push(ModuleTypeDef::Export(
+ "canonical_abi_realloc".into(),
+ crate::core::EntityType::Func(ty_idx, realloc_ty),
+ ));
+ exports.insert("canonical_abi_realloc".into());
+ counts.funcs += 1;
+ has_canonical_abi_realloc = true;
+ }
+
+ // `canonical_abi_free`
+ if counts.funcs < self.config.max_funcs
+ && types.len() < self.config.max_types
+ && u.ratio::<u8>(99, 100)?
+ {
+ let free_ty = Rc::new(crate::core::FuncType {
+ params: vec![ValType::I32, ValType::I32, ValType::I32],
+ results: vec![],
+ });
+ let ty_idx = u32::try_from(types.len()).unwrap();
+ types.push(free_ty.clone());
+ defs.push(ModuleTypeDef::TypeDef(crate::core::CompositeType::Func(
+ free_ty.clone(),
+ )));
+ defs.push(ModuleTypeDef::Export(
+ "canonical_abi_free".into(),
+ crate::core::EntityType::Func(ty_idx, free_ty),
+ ));
+ exports.insert("canonical_abi_free".into());
+ counts.funcs += 1;
+ has_canonical_abi_free = true;
+ }
+
+ let mut entity_choices: Vec<
+ fn(
+ &ComponentBuilder,
+ &mut Unstructured,
+ &mut EntityCounts,
+ &[Rc<crate::core::FuncType>],
+ ) -> Result<crate::core::EntityType>,
+ > = Vec::with_capacity(5);
+
+ arbitrary_loop(u, 0, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ let max_choice = if types.len() < self.config.max_types {
+ // Check if the parent scope has core function types to alias
+ if !types.is_empty()
+ || (!self.types.is_empty()
+ && !self.types.last().unwrap().core_func_types.is_empty())
+ {
+ // Imports, exports, types, and aliases
+ 3
+ } else {
+ // Imports, exports, and types
+ 2
+ }
+ } else {
+ // Imports and exports
+ 1
+ };
+
+ match u.int_in_range::<u8>(0..=max_choice)? {
+ // Import.
+ 0 => {
+ let module = crate::limited_string(100, u)?;
+ let existing_module_imports = imports.entry(module.clone()).or_default();
+ let field = crate::unique_string(100, existing_module_imports, u)?;
+ let entity_type = match self.arbitrary_core_entity_type(
+ u,
+ &types,
+ &mut entity_choices,
+ &mut counts,
+ )? {
+ None => return Ok(false),
+ Some(x) => x,
+ };
+ defs.push(ModuleTypeDef::Import(crate::core::Import {
+ module,
+ field,
+ entity_type,
+ }));
+ }
+
+ // Export.
+ 1 => {
+ let name = crate::unique_string(100, &mut exports, u)?;
+ let entity_ty = match self.arbitrary_core_entity_type(
+ u,
+ &types,
+ &mut entity_choices,
+ &mut counts,
+ )? {
+ None => return Ok(false),
+ Some(x) => x,
+ };
+ defs.push(ModuleTypeDef::Export(name, entity_ty));
+ }
+
+ // Type definition.
+ 2 => {
+ let ty = crate::core::arbitrary_func_type(
+ u,
+ &self.config,
+ &self.core_valtypes,
+ if self.config.multi_value_enabled {
+ None
+ } else {
+ Some(1)
+ },
+ 0,
+ )?;
+ types.push(ty.clone());
+ defs.push(ModuleTypeDef::TypeDef(crate::core::CompositeType::Func(ty)));
+ }
+
+ // Alias
+ 3 => {
+ let (count, index, kind) = self.arbitrary_outer_core_type_alias(u, &types)?;
+ let ty = match &kind {
+ CoreOuterAliasKind::Type(ty) => ty.clone(),
+ };
+ types.push(ty);
+ defs.push(ModuleTypeDef::OuterAlias {
+ count,
+ i: index,
+ kind,
+ });
+ }
+
+ _ => unreachable!(),
+ }
+
+ Ok(true)
+ })?;
+
+ Ok(Rc::new(ModuleType {
+ defs,
+ has_memory,
+ has_canonical_abi_realloc,
+ has_canonical_abi_free,
+ }))
+ }
+
+ fn arbitrary_core_entity_type(
+ &self,
+ u: &mut Unstructured,
+ types: &[Rc<crate::core::FuncType>],
+ choices: &mut Vec<
+ fn(
+ &ComponentBuilder,
+ &mut Unstructured,
+ &mut EntityCounts,
+ &[Rc<crate::core::FuncType>],
+ ) -> Result<crate::core::EntityType>,
+ >,
+ counts: &mut EntityCounts,
+ ) -> Result<Option<crate::core::EntityType>> {
+ choices.clear();
+
+ if counts.globals < self.config.max_globals {
+ choices.push(|c, u, counts, _types| {
+ counts.globals += 1;
+ Ok(crate::core::EntityType::Global(
+ c.arbitrary_core_global_type(u)?,
+ ))
+ });
+ }
+
+ if counts.tables < self.config.max_tables {
+ choices.push(|c, u, counts, _types| {
+ counts.tables += 1;
+ Ok(crate::core::EntityType::Table(
+ c.arbitrary_core_table_type(u)?,
+ ))
+ });
+ }
+
+ if counts.memories < self.config.max_memories {
+ choices.push(|c, u, counts, _types| {
+ counts.memories += 1;
+ Ok(crate::core::EntityType::Memory(
+ c.arbitrary_core_memory_type(u)?,
+ ))
+ });
+ }
+
+ if types.iter().any(|ty| ty.results.is_empty())
+ && self.config.exceptions_enabled
+ && counts.tags < self.config.max_tags
+ {
+ choices.push(|c, u, counts, types| {
+ counts.tags += 1;
+ let tag_func_types = types
+ .iter()
+ .enumerate()
+ .filter(|(_, ty)| ty.results.is_empty())
+ .map(|(i, _)| u32::try_from(i).unwrap())
+ .collect::<Vec<_>>();
+ Ok(crate::core::EntityType::Tag(
+ crate::core::arbitrary_tag_type(u, &tag_func_types, |idx| {
+ types[usize::try_from(idx).unwrap()].clone()
+ })?,
+ ))
+ });
+ }
+
+ if !types.is_empty() && counts.funcs < self.config.max_funcs {
+ choices.push(|c, u, counts, types| {
+ counts.funcs += 1;
+ let ty_idx = u.int_in_range(0..=u32::try_from(types.len() - 1).unwrap())?;
+ let ty = types[ty_idx as usize].clone();
+ Ok(crate::core::EntityType::Func(ty_idx, ty))
+ });
+ }
+
+ if choices.is_empty() {
+ return Ok(None);
+ }
+
+ let f = u.choose(choices)?;
+ let ty = f(self, u, counts, types)?;
+ Ok(Some(ty))
+ }
+
+ fn arbitrary_core_valtype(&self, u: &mut Unstructured) -> Result<ValType> {
+ Ok(*u.choose(&self.core_valtypes)?)
+ }
+
+ fn arbitrary_core_global_type(&self, u: &mut Unstructured) -> Result<crate::core::GlobalType> {
+ Ok(crate::core::GlobalType {
+ val_type: self.arbitrary_core_valtype(u)?,
+ mutable: u.arbitrary()?,
+ })
+ }
+
+ fn arbitrary_core_table_type(&self, u: &mut Unstructured) -> Result<crate::core::TableType> {
+ crate::core::arbitrary_table_type(u, &self.config)
+ }
+
+ fn arbitrary_core_memory_type(&self, u: &mut Unstructured) -> Result<crate::core::MemoryType> {
+ crate::core::arbitrary_memtype(u, &self.config)
+ }
+
+ fn with_types_scope<T>(&mut self, f: impl FnOnce(&mut Self) -> Result<T>) -> Result<T> {
+ self.types.push(Default::default());
+ let result = f(self);
+ self.types.pop();
+ result
+ }
+
+ fn current_type_scope(&self) -> &TypesScope {
+ self.types.last().unwrap()
+ }
+
+ fn current_type_scope_mut(&mut self) -> &mut TypesScope {
+ self.types.last_mut().unwrap()
+ }
+
+ fn outer_types_scope(&self, count: u32) -> &TypesScope {
+ &self.types[self.types.len() - 1 - usize::try_from(count).unwrap()]
+ }
+
+ fn outer_type(&self, count: u32, i: u32) -> &Rc<Type> {
+ &self.outer_types_scope(count).types[usize::try_from(i).unwrap()]
+ }
+
+ fn arbitrary_component_type(
+ &mut self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<Rc<ComponentType>> {
+ let mut defs = vec![];
+ let mut imports = HashSet::new();
+ let mut import_urls = HashSet::new();
+ let mut exports = HashSet::new();
+ let mut export_urls = HashSet::new();
+
+ self.with_types_scope(|me| {
+ arbitrary_loop(u, 0, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ if me.current_type_scope().can_ref_type() && u.int_in_range::<u8>(0..=3)? == 0 {
+ if let Some(ty) = me.arbitrary_type_ref(u, true, true)? {
+ // Imports.
+ let name = crate::unique_kebab_string(100, &mut imports, u)?;
+ let url = if u.arbitrary()? {
+ Some(crate::unique_url(100, &mut import_urls, u)?)
+ } else {
+ None
+ };
+ defs.push(ComponentTypeDef::Import(Import { name, url, ty }));
+ return Ok(true);
+ }
+
+ // Can't reference an arbitrary type, fallback to another definition.
+ }
+
+ // Type definitions, exports, and aliases.
+ let def =
+ me.arbitrary_instance_type_def(u, &mut exports, &mut export_urls, type_fuel)?;
+ defs.push(def.into());
+ Ok(true)
+ })
+ })?;
+
+ Ok(Rc::new(ComponentType { defs }))
+ }
+
+ fn arbitrary_instance_type(
+ &mut self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<Rc<InstanceType>> {
+ let mut defs = vec![];
+ let mut exports = HashSet::new();
+ let mut export_urls = HashSet::new();
+
+ self.with_types_scope(|me| {
+ arbitrary_loop(u, 0, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ defs.push(me.arbitrary_instance_type_def(
+ u,
+ &mut exports,
+ &mut export_urls,
+ type_fuel,
+ )?);
+ Ok(true)
+ })
+ })?;
+
+ Ok(Rc::new(InstanceType { defs }))
+ }
+
+ fn arbitrary_instance_type_def(
+ &mut self,
+ u: &mut Unstructured,
+ exports: &mut HashSet<String>,
+ export_urls: &mut HashSet<String>,
+ type_fuel: &mut u32,
+ ) -> Result<InstanceTypeDecl> {
+ let mut choices: Vec<
+ fn(
+ &mut ComponentBuilder,
+ &mut HashSet<String>,
+ &mut HashSet<String>,
+ &mut Unstructured,
+ &mut u32,
+ ) -> Result<InstanceTypeDecl>,
+ > = Vec::with_capacity(3);
+
+ // Export.
+ if self.current_type_scope().can_ref_type() {
+ choices.push(|me, exports, export_urls, u, _type_fuel| {
+ let ty = me.arbitrary_type_ref(u, false, true)?.unwrap();
+ if let ComponentTypeRef::Type(TypeBounds::Eq(idx)) = ty {
+ let ty = me.current_type_scope().get(idx).clone();
+ me.current_type_scope_mut().push(ty);
+ }
+ Ok(InstanceTypeDecl::Export {
+ name: crate::unique_kebab_string(100, exports, u)?,
+ url: if u.arbitrary()? {
+ Some(crate::unique_url(100, export_urls, u)?)
+ } else {
+ None
+ },
+ ty,
+ })
+ });
+ }
+
+ // Outer type alias.
+ if self
+ .types
+ .iter()
+ .any(|scope| !scope.types.is_empty() || !scope.core_types.is_empty())
+ {
+ choices.push(|me, _exports, _export_urls, u, _type_fuel| {
+ let alias = me.arbitrary_outer_type_alias(u)?;
+ match &alias {
+ Alias::Outer {
+ kind: OuterAliasKind::Type(ty),
+ ..
+ } => me.current_type_scope_mut().push(ty.clone()),
+ Alias::Outer {
+ kind: OuterAliasKind::CoreType(ty),
+ ..
+ } => me.current_type_scope_mut().push_core(ty.clone()),
+ _ => unreachable!(),
+ };
+ Ok(InstanceTypeDecl::Alias(alias))
+ });
+ }
+
+ // Core type definition.
+ choices.push(|me, _exports, _export_urls, u, type_fuel| {
+ let ty = me.arbitrary_core_type(u, type_fuel)?;
+ me.current_type_scope_mut().push_core(ty.clone());
+ Ok(InstanceTypeDecl::CoreType(ty))
+ });
+
+ // Type definition.
+ if self.types.len() < self.config.max_nesting_depth {
+ choices.push(|me, _exports, _export_urls, u, type_fuel| {
+ let ty = me.arbitrary_type(u, type_fuel)?;
+ me.current_type_scope_mut().push(ty.clone());
+ Ok(InstanceTypeDecl::Type(ty))
+ });
+ }
+
+ let f = u.choose(&choices)?;
+ f(self, exports, export_urls, u, type_fuel)
+ }
+
+ fn arbitrary_outer_core_type_alias(
+ &self,
+ u: &mut Unstructured,
+ local_types: &[Rc<crate::core::FuncType>],
+ ) -> Result<(u32, u32, CoreOuterAliasKind)> {
+ let enclosing_type_len = if !self.types.is_empty() {
+ self.types.last().unwrap().core_func_types.len()
+ } else {
+ 0
+ };
+
+ assert!(!local_types.is_empty() || enclosing_type_len > 0);
+
+ let max = enclosing_type_len + local_types.len() - 1;
+ let i = u.int_in_range(0..=max)?;
+ let (count, index, ty) = if i < enclosing_type_len {
+ let enclosing = self.types.last().unwrap();
+ let index = enclosing.core_func_types[i];
+ (
+ 1,
+ index,
+ match enclosing.get_core(index).as_ref() {
+ CoreType::Func(ty) => ty.clone(),
+ CoreType::Module(_) => unreachable!(),
+ },
+ )
+ } else if i - enclosing_type_len < local_types.len() {
+ let i = i - enclosing_type_len;
+ (0, u32::try_from(i).unwrap(), local_types[i].clone())
+ } else {
+ unreachable!()
+ };
+
+ Ok((count, index, CoreOuterAliasKind::Type(ty)))
+ }
+
+ fn arbitrary_outer_type_alias(&self, u: &mut Unstructured) -> Result<Alias> {
+ let non_empty_types_scopes: Vec<_> = self
+ .types
+ .iter()
+ .rev()
+ .enumerate()
+ .filter(|(_, scope)| !scope.types.is_empty() || !scope.core_types.is_empty())
+ .collect();
+ assert!(
+ !non_empty_types_scopes.is_empty(),
+ "precondition: there are non-empty types scopes"
+ );
+
+ let (count, scope) = u.choose(&non_empty_types_scopes)?;
+ let count = u32::try_from(*count).unwrap();
+ assert!(!scope.types.is_empty() || !scope.core_types.is_empty());
+
+ let max_type_in_scope = scope.types.len() + scope.core_types.len() - 1;
+ let i = u.int_in_range(0..=max_type_in_scope)?;
+
+ let (i, kind) = if i < scope.types.len() {
+ let i = u32::try_from(i).unwrap();
+ (i, OuterAliasKind::Type(Rc::clone(scope.get(i))))
+ } else if i - scope.types.len() < scope.core_types.len() {
+ let i = u32::try_from(i - scope.types.len()).unwrap();
+ (i, OuterAliasKind::CoreType(Rc::clone(scope.get_core(i))))
+ } else {
+ unreachable!()
+ };
+
+ Ok(Alias::Outer { count, i, kind })
+ }
+
+ fn arbitrary_func_type(
+ &self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<Rc<FuncType>> {
+ let mut params = Vec::new();
+ let mut results = Vec::new();
+ let mut names = HashSet::new();
+
+ // Note: parameters are currently limited to a maximum of 16
+ // because any additional parameters will require indirect access
+ // via a pointer argument; when this occurs, validation of any
+ // lowered function will fail because it will be missing a
+ // memory option (not yet implemented).
+ //
+ // When options are correctly specified on canonical functions,
+ // we should increase this maximum to test indirect parameter
+ // passing.
+ arbitrary_loop(u, 0, 16, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ let name = crate::unique_kebab_string(100, &mut names, u)?;
+ let ty = self.arbitrary_component_val_type(u)?;
+
+ params.push((name, ty));
+
+ Ok(true)
+ })?;
+
+ names.clear();
+
+ // Likewise, the limit for results is 1 before the memory option is
+ // required. When the memory option is implemented, this restriction
+ // should be relaxed.
+ arbitrary_loop(u, 0, 1, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ // If the result list is empty (i.e. first push), then arbitrarily give
+ // the result a name. Otherwise, all of the subsequent items must be named.
+ let name = if results.is_empty() {
+ // Most of the time we should have a single, unnamed result.
+ u.ratio::<u8>(10, 100)?
+ .then(|| crate::unique_kebab_string(100, &mut names, u))
+ .transpose()?
+ } else {
+ Some(crate::unique_kebab_string(100, &mut names, u)?)
+ };
+
+ let ty = self.arbitrary_component_val_type(u)?;
+
+ results.push((name, ty));
+
+ // There can be only one unnamed result.
+ if results.len() == 1 && results[0].0.is_none() {
+ return Ok(false);
+ }
+
+ Ok(true)
+ })?;
+
+ Ok(Rc::new(FuncType { params, results }))
+ }
+
+ fn arbitrary_component_val_type(&self, u: &mut Unstructured) -> Result<ComponentValType> {
+ let max_choices = if self.current_type_scope().defined_types.is_empty() {
+ 0
+ } else {
+ 1
+ };
+ match u.int_in_range(0..=max_choices)? {
+ 0 => Ok(ComponentValType::Primitive(
+ self.arbitrary_primitive_val_type(u)?,
+ )),
+ 1 => {
+ let index = *u.choose(&self.current_type_scope().defined_types)?;
+ let ty = Rc::clone(self.current_type_scope().get(index));
+ Ok(ComponentValType::Type(index))
+ }
+ _ => unreachable!(),
+ }
+ }
+
+ fn arbitrary_primitive_val_type(&self, u: &mut Unstructured) -> Result<PrimitiveValType> {
+ match u.int_in_range(0..=12)? {
+ 0 => Ok(PrimitiveValType::Bool),
+ 1 => Ok(PrimitiveValType::S8),
+ 2 => Ok(PrimitiveValType::U8),
+ 3 => Ok(PrimitiveValType::S16),
+ 4 => Ok(PrimitiveValType::U16),
+ 5 => Ok(PrimitiveValType::S32),
+ 6 => Ok(PrimitiveValType::U32),
+ 7 => Ok(PrimitiveValType::S64),
+ 8 => Ok(PrimitiveValType::U64),
+ 9 => Ok(PrimitiveValType::Float32),
+ 10 => Ok(PrimitiveValType::Float64),
+ 11 => Ok(PrimitiveValType::Char),
+ 12 => Ok(PrimitiveValType::String),
+ _ => unreachable!(),
+ }
+ }
+
+ fn arbitrary_record_type(
+ &self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<RecordType> {
+ let mut fields = vec![];
+ let mut field_names = HashSet::new();
+ arbitrary_loop(u, 0, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ let name = crate::unique_kebab_string(100, &mut field_names, u)?;
+ let ty = self.arbitrary_component_val_type(u)?;
+
+ fields.push((name, ty));
+ Ok(true)
+ })?;
+ Ok(RecordType { fields })
+ }
+
+ fn arbitrary_variant_type(
+ &self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<VariantType> {
+ let mut cases = vec![];
+ let mut case_names = HashSet::new();
+ arbitrary_loop(u, 1, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ let name = crate::unique_kebab_string(100, &mut case_names, u)?;
+
+ let ty = u
+ .arbitrary::<bool>()?
+ .then(|| self.arbitrary_component_val_type(u))
+ .transpose()?;
+
+ let refines = if !cases.is_empty() && u.arbitrary()? {
+ let max_cases = u32::try_from(cases.len() - 1).unwrap();
+ Some(u.int_in_range(0..=max_cases)?)
+ } else {
+ None
+ };
+
+ cases.push((name, ty, refines));
+ Ok(true)
+ })?;
+
+ Ok(VariantType { cases })
+ }
+
+ fn arbitrary_list_type(&self, u: &mut Unstructured) -> Result<ListType> {
+ Ok(ListType {
+ elem_ty: self.arbitrary_component_val_type(u)?,
+ })
+ }
+
+ fn arbitrary_tuple_type(&self, u: &mut Unstructured, type_fuel: &mut u32) -> Result<TupleType> {
+ let mut fields = vec![];
+ arbitrary_loop(u, 0, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ fields.push(self.arbitrary_component_val_type(u)?);
+ Ok(true)
+ })?;
+ Ok(TupleType { fields })
+ }
+
+ fn arbitrary_flags_type(&self, u: &mut Unstructured, type_fuel: &mut u32) -> Result<FlagsType> {
+ let mut fields = vec![];
+ let mut field_names = HashSet::new();
+ arbitrary_loop(u, 0, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ fields.push(crate::unique_kebab_string(100, &mut field_names, u)?);
+ Ok(true)
+ })?;
+ Ok(FlagsType { fields })
+ }
+
+ fn arbitrary_enum_type(&self, u: &mut Unstructured, type_fuel: &mut u32) -> Result<EnumType> {
+ let mut variants = vec![];
+ let mut variant_names = HashSet::new();
+ arbitrary_loop(u, 1, 100, |u| {
+ *type_fuel = type_fuel.saturating_sub(1);
+ if *type_fuel == 0 {
+ return Ok(false);
+ }
+
+ variants.push(crate::unique_kebab_string(100, &mut variant_names, u)?);
+ Ok(true)
+ })?;
+ Ok(EnumType { variants })
+ }
+
+ fn arbitrary_option_type(&self, u: &mut Unstructured) -> Result<OptionType> {
+ Ok(OptionType {
+ inner_ty: self.arbitrary_component_val_type(u)?,
+ })
+ }
+
+ fn arbitrary_result_type(&self, u: &mut Unstructured) -> Result<ResultType> {
+ Ok(ResultType {
+ ok_ty: u
+ .arbitrary::<bool>()?
+ .then(|| self.arbitrary_component_val_type(u))
+ .transpose()?,
+ err_ty: u
+ .arbitrary::<bool>()?
+ .then(|| self.arbitrary_component_val_type(u))
+ .transpose()?,
+ })
+ }
+
+ fn arbitrary_defined_type(
+ &self,
+ u: &mut Unstructured,
+ type_fuel: &mut u32,
+ ) -> Result<DefinedType> {
+ match u.int_in_range(0..=8)? {
+ 0 => Ok(DefinedType::Primitive(
+ self.arbitrary_primitive_val_type(u)?,
+ )),
+ 1 => Ok(DefinedType::Record(
+ self.arbitrary_record_type(u, type_fuel)?,
+ )),
+ 2 => Ok(DefinedType::Variant(
+ self.arbitrary_variant_type(u, type_fuel)?,
+ )),
+ 3 => Ok(DefinedType::List(self.arbitrary_list_type(u)?)),
+ 4 => Ok(DefinedType::Tuple(self.arbitrary_tuple_type(u, type_fuel)?)),
+ 5 => Ok(DefinedType::Flags(self.arbitrary_flags_type(u, type_fuel)?)),
+ 6 => Ok(DefinedType::Enum(self.arbitrary_enum_type(u, type_fuel)?)),
+ 7 => Ok(DefinedType::Option(self.arbitrary_option_type(u)?)),
+ 8 => Ok(DefinedType::Result(self.arbitrary_result_type(u)?)),
+ _ => unreachable!(),
+ }
+ }
+
+ fn push_import(&mut self, name: String, url: Option<String>, ty: ComponentTypeRef) {
+ let nth = match self.ensure_section(
+ |sec| matches!(sec, Section::Import(_)),
+ || Section::Import(ImportSection { imports: vec![] }),
+ ) {
+ Section::Import(sec) => {
+ sec.imports.push(Import { name, url, ty });
+ sec.imports.len() - 1
+ }
+ _ => unreachable!(),
+ };
+ let section_index = self.component().component.sections.len() - 1;
+
+ match ty {
+ ComponentTypeRef::Module(_) => {
+ self.total_modules += 1;
+ self.component_mut().modules.push((section_index, nth));
+ }
+ ComponentTypeRef::Func(ty_index) => {
+ let func_ty = match self.current_type_scope().get(ty_index).as_ref() {
+ Type::Func(ty) => ty.clone(),
+ _ => unreachable!(),
+ };
+
+ if func_ty.is_scalar() {
+ let func_index = u32::try_from(self.component().component_funcs.len()).unwrap();
+ self.component_mut().scalar_component_funcs.push(func_index);
+ }
+
+ let func_index = u32::try_from(self.component().funcs.len()).unwrap();
+ self.component_mut()
+ .funcs
+ .push(ComponentOrCoreFuncType::Component(func_ty));
+
+ self.component_mut().component_funcs.push(func_index);
+ }
+ ComponentTypeRef::Value(ty) => {
+ self.total_values += 1;
+ self.component_mut().values.push(ty);
+ }
+ ComponentTypeRef::Type(TypeBounds::Eq(ty_index)) => {
+ let ty = self.current_type_scope().get(ty_index).clone();
+ self.current_type_scope_mut().push(ty);
+ }
+ ComponentTypeRef::Type(TypeBounds::SubResource) => {
+ unimplemented!()
+ }
+ ComponentTypeRef::Instance(ty_index) => {
+ let instance_ty = match self.current_type_scope().get(ty_index).as_ref() {
+ Type::Instance(ty) => ty.clone(),
+ _ => unreachable!(),
+ };
+
+ self.total_instances += 1;
+ self.component_mut()
+ .instances
+ .push(ComponentOrCoreInstanceType::Component(instance_ty));
+ }
+ ComponentTypeRef::Component(_) => {
+ self.total_components += 1;
+ self.component_mut().components.push((section_index, nth));
+ }
+ }
+ }
+
+ fn core_function_type(&self, core_func_index: u32) -> &Rc<crate::core::FuncType> {
+ self.component().funcs[self.component().core_funcs[core_func_index as usize] as usize]
+ .as_core()
+ }
+
+ fn component_function_type(&self, func_index: u32) -> &Rc<FuncType> {
+ self.component().funcs[self.component().component_funcs[func_index as usize] as usize]
+ .as_component()
+ }
+
+ fn push_func(&mut self, func: Func) {
+ let nth = match self.component_mut().component.sections.last_mut() {
+ Some(Section::Canonical(CanonicalSection { funcs })) => funcs.len(),
+ _ => {
+ self.push_section(Section::Canonical(CanonicalSection { funcs: vec![] }));
+ 0
+ }
+ };
+ let section_index = self.component().component.sections.len() - 1;
+
+ let func_index = u32::try_from(self.component().funcs.len()).unwrap();
+
+ let ty = match &func {
+ Func::CanonLift { func_ty, .. } => {
+ let ty = Rc::clone(self.current_type_scope().get_func(*func_ty));
+ if ty.is_scalar() {
+ let func_index = u32::try_from(self.component().component_funcs.len()).unwrap();
+ self.component_mut().scalar_component_funcs.push(func_index);
+ }
+ self.component_mut().component_funcs.push(func_index);
+ ComponentOrCoreFuncType::Component(ty)
+ }
+ Func::CanonLower {
+ func_index: comp_func_index,
+ ..
+ } => {
+ let comp_func_ty = self.component_function_type(*comp_func_index);
+ let core_func_ty = canonical_abi_for(comp_func_ty);
+ self.component_mut().core_funcs.push(func_index);
+ ComponentOrCoreFuncType::Core(core_func_ty)
+ }
+ };
+
+ self.component_mut().funcs.push(ty);
+
+ match self.component_mut().component.sections.last_mut() {
+ Some(Section::Canonical(CanonicalSection { funcs })) => funcs.push(func),
+ _ => unreachable!(),
+ }
+ }
+
+ fn arbitrary_import_section(&mut self, u: &mut Unstructured) -> Result<Step> {
+ self.push_section(Section::Import(ImportSection { imports: vec![] }));
+
+ let min = if self.fill_minimums {
+ self.config
+ .min_imports
+ .saturating_sub(self.component().num_imports)
+ } else {
+ // Allow generating empty sections. We can always fill in the required
+ // minimum later.
+ 0
+ };
+ let max = self.config.max_imports - self.component().num_imports;
+
+ crate::arbitrary_loop(u, min, max, |u| {
+ match self.arbitrary_type_ref(u, true, false)? {
+ Some(ty) => {
+ let name =
+ crate::unique_kebab_string(100, &mut self.component_mut().import_names, u)?;
+ let url = if u.arbitrary()? {
+ Some(crate::unique_url(
+ 100,
+ &mut self.component_mut().import_urls,
+ u,
+ )?)
+ } else {
+ None
+ };
+ self.push_import(name, url, ty);
+ Ok(true)
+ }
+ None => Ok(false),
+ }
+ })?;
+
+ Ok(Step::StillBuilding)
+ }
+
+ fn arbitrary_canonical_section(&mut self, u: &mut Unstructured) -> Result<Step> {
+ self.push_section(Section::Canonical(CanonicalSection { funcs: vec![] }));
+
+ let min = if self.fill_minimums {
+ self.config
+ .min_funcs
+ .saturating_sub(self.component().funcs.len())
+ } else {
+ // Allow generating empty sections. We can always fill in the
+ // required minimum later.
+ 0
+ };
+ let max = self.config.max_funcs - self.component().funcs.len();
+
+ let mut choices: Vec<fn(&mut Unstructured, &mut ComponentBuilder) -> Result<Option<Func>>> =
+ Vec::with_capacity(2);
+
+ crate::arbitrary_loop(u, min, max, |u| {
+ choices.clear();
+
+ // NB: We only lift/lower scalar component functions.
+ //
+ // If we generated lifting and lowering of compound value types,
+ // the probability of generating a corresponding Wasm module that
+ // generates valid instances of the compound value types would
+ // be vanishingly tiny (e.g. for `list<string>` we would have to
+ // generate a core Wasm module that correctly produces a pointer and
+ // length for a memory region that itself is a series of pointers
+ // and lengths of valid strings, as well as `canonical_abi_realloc`
+ // and `canonical_abi_free` functions that do the right thing).
+ //
+ // This is a pretty serious limitation of `wasm-smith`'s component
+ // types support, but it is one we are intentionally
+ // accepting. `wasm-smith` will focus on generating arbitrary
+ // component sections, structures, and import/export topologies; not
+ // component functions and core Wasm implementations of component
+ // functions. In the future, we intend to build a new, distinct test
+ // case generator specifically for exercising component functions
+ // and the canonical ABI. This new generator won't emit arbitrary
+ // component sections, structures, or import/export topologies, and
+ // will instead leave that to `wasm-smith`.
+
+ if !self.component().scalar_component_funcs.is_empty() {
+ choices.push(|u, c| {
+ let func_index = *u.choose(&c.component().scalar_component_funcs)?;
+ Ok(Some(Func::CanonLower {
+ // Scalar component functions don't use any canonical options.
+ options: vec![],
+ func_index,
+ }))
+ });
+ }
+
+ if !self.component().core_funcs.is_empty() {
+ choices.push(|u, c| {
+ let core_func_index = u.int_in_range(
+ 0..=u32::try_from(c.component().core_funcs.len() - 1).unwrap(),
+ )?;
+ let core_func_ty = c.core_function_type(core_func_index);
+ let comp_func_ty = inverse_scalar_canonical_abi_for(u, core_func_ty)?;
+
+ let func_ty = if let Some(indices) = c
+ .current_type_scope()
+ .func_type_to_indices
+ .get(&comp_func_ty)
+ {
+ // If we've already defined this component function type
+ // one or more times, then choose one of those
+ // definitions arbitrarily.
+ debug_assert!(!indices.is_empty());
+ *u.choose(indices)?
+ } else if c.current_type_scope().types.len() < c.config.max_types {
+ // If we haven't already defined this component function
+ // type, and we haven't defined the configured maximum
+ // amount of types yet, then just define this type.
+ let ty = Rc::new(Type::Func(Rc::new(comp_func_ty)));
+ c.push_type(ty)
+ } else {
+ // Otherwise, give up on lifting this function.
+ return Ok(None);
+ };
+
+ Ok(Some(Func::CanonLift {
+ func_ty,
+ // Scalar functions don't use any canonical options.
+ options: vec![],
+ core_func_index,
+ }))
+ });
+ }
+
+ if choices.is_empty() {
+ return Ok(false);
+ }
+
+ let f = u.choose(&choices)?;
+ if let Some(func) = f(u, self)? {
+ self.push_func(func);
+ }
+
+ Ok(true)
+ })?;
+
+ Ok(Step::StillBuilding)
+ }
+
+ fn arbitrary_core_module_section(&mut self, u: &mut Unstructured) -> Result<Step> {
+ let module = crate::core::Module::new_internal(
+ self.config.clone(),
+ u,
+ crate::core::DuplicateImportsBehavior::Disallowed,
+ )?;
+ self.push_section(Section::CoreModule(module));
+ self.total_modules += 1;
+ Ok(Step::StillBuilding)
+ }
+
+ fn arbitrary_component_section(&mut self, u: &mut Unstructured) -> Result<Step> {
+ self.types.push(TypesScope::default());
+ self.components.push(ComponentContext::empty());
+ self.total_components += 1;
+ Ok(Step::StillBuilding)
+ }
+
+ fn arbitrary_instance_section(&mut self, u: &mut Unstructured) -> Result<()> {
+ todo!()
+ }
+
+ fn arbitrary_export_section(&mut self, u: &mut Unstructured) -> Result<()> {
+ todo!()
+ }
+
+ fn arbitrary_start_section(&mut self, u: &mut Unstructured) -> Result<()> {
+ todo!()
+ }
+
+ fn arbitrary_alias_section(&mut self, u: &mut Unstructured) -> Result<()> {
+ todo!()
+ }
+}
+
+fn canonical_abi_for(func_ty: &FuncType) -> Rc<crate::core::FuncType> {
+ let to_core_ty = |ty| match ty {
+ ComponentValType::Primitive(prim_ty) => match prim_ty {
+ PrimitiveValType::Char
+ | PrimitiveValType::Bool
+ | PrimitiveValType::S8
+ | PrimitiveValType::U8
+ | PrimitiveValType::S16
+ | PrimitiveValType::U16
+ | PrimitiveValType::S32
+ | PrimitiveValType::U32 => ValType::I32,
+ PrimitiveValType::S64 | PrimitiveValType::U64 => ValType::I64,
+ PrimitiveValType::Float32 => ValType::F32,
+ PrimitiveValType::Float64 => ValType::F64,
+ PrimitiveValType::String => {
+ unimplemented!("non-scalar types are not supported yet")
+ }
+ },
+ ComponentValType::Type(_) => unimplemented!("non-scalar types are not supported yet"),
+ };
+
+ Rc::new(crate::core::FuncType {
+ params: func_ty
+ .params
+ .iter()
+ .map(|(_, ty)| to_core_ty(*ty))
+ .collect(),
+ results: func_ty
+ .results
+ .iter()
+ .map(|(_, ty)| to_core_ty(*ty))
+ .collect(),
+ })
+}
+
+fn inverse_scalar_canonical_abi_for(
+ u: &mut Unstructured,
+ core_func_ty: &crate::core::FuncType,
+) -> Result<FuncType> {
+ let from_core_ty = |u: &mut Unstructured, core_ty| match core_ty {
+ ValType::I32 => u
+ .choose(&[
+ ComponentValType::Primitive(PrimitiveValType::Char),
+ ComponentValType::Primitive(PrimitiveValType::Bool),
+ ComponentValType::Primitive(PrimitiveValType::S8),
+ ComponentValType::Primitive(PrimitiveValType::U8),
+ ComponentValType::Primitive(PrimitiveValType::S16),
+ ComponentValType::Primitive(PrimitiveValType::U16),
+ ComponentValType::Primitive(PrimitiveValType::S32),
+ ComponentValType::Primitive(PrimitiveValType::U32),
+ ])
+ .cloned(),
+ ValType::I64 => u
+ .choose(&[
+ ComponentValType::Primitive(PrimitiveValType::S64),
+ ComponentValType::Primitive(PrimitiveValType::U64),
+ ])
+ .cloned(),
+ ValType::F32 => Ok(ComponentValType::Primitive(PrimitiveValType::Float32)),
+ ValType::F64 => Ok(ComponentValType::Primitive(PrimitiveValType::Float64)),
+ ValType::V128 | ValType::Ref(_) => {
+ unreachable!("not used in canonical ABI")
+ }
+ };
+
+ let mut names = HashSet::default();
+ let mut params = vec![];
+
+ for core_ty in &core_func_ty.params {
+ params.push((
+ crate::unique_kebab_string(100, &mut names, u)?,
+ from_core_ty(u, *core_ty)?,
+ ));
+ }
+
+ names.clear();
+
+ let results = match core_func_ty.results.len() {
+ 0 => Vec::new(),
+ 1 => vec![(
+ if u.arbitrary()? {
+ Some(crate::unique_kebab_string(100, &mut names, u)?)
+ } else {
+ None
+ },
+ from_core_ty(u, core_func_ty.results[0])?,
+ )],
+ _ => unimplemented!("non-scalar types are not supported yet"),
+ };
+
+ Ok(FuncType { params, results })
+}
+
+#[derive(Debug)]
+enum Section {
+ Custom(CustomSection),
+ CoreModule(crate::Module),
+ CoreInstance(CoreInstanceSection),
+ CoreType(CoreTypeSection),
+ Component(Component),
+ Instance(InstanceSection),
+ Alias(AliasSection),
+ Type(TypeSection),
+ Canonical(CanonicalSection),
+ Start(StartSection),
+ Import(ImportSection),
+ Export(ExportSection),
+}
+
+#[derive(Debug)]
+struct CustomSection {
+ name: String,
+ data: Vec<u8>,
+}
+
+impl<'a> Arbitrary<'a> for CustomSection {
+ fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self> {
+ let name = crate::limited_string(1_000, u)?;
+ let data = u.arbitrary()?;
+ Ok(CustomSection { name, data })
+ }
+}
+
+#[derive(Debug)]
+struct TypeSection {
+ types: Vec<Rc<Type>>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum CoreType {
+ Func(Rc<crate::core::FuncType>),
+ Module(Rc<ModuleType>),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Default)]
+struct ModuleType {
+ defs: Vec<ModuleTypeDef>,
+ has_memory: bool,
+ has_canonical_abi_realloc: bool,
+ has_canonical_abi_free: bool,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum ModuleTypeDef {
+ TypeDef(crate::core::CompositeType),
+ Import(crate::core::Import),
+ OuterAlias {
+ count: u32,
+ i: u32,
+ kind: CoreOuterAliasKind,
+ },
+ Export(String, crate::core::EntityType),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum Type {
+ Defined(DefinedType),
+ Func(Rc<FuncType>),
+ Component(Rc<ComponentType>),
+ Instance(Rc<InstanceType>),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum CoreInstanceExportAliasKind {
+ Func,
+ Table,
+ Memory,
+ Global,
+ Tag,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum CoreOuterAliasKind {
+ Type(Rc<crate::core::FuncType>),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum Alias {
+ InstanceExport {
+ instance: u32,
+ name: String,
+ kind: InstanceExportAliasKind,
+ },
+ CoreInstanceExport {
+ instance: u32,
+ name: String,
+ kind: CoreInstanceExportAliasKind,
+ },
+ Outer {
+ count: u32,
+ i: u32,
+ kind: OuterAliasKind,
+ },
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum InstanceExportAliasKind {
+ Module,
+ Component,
+ Instance,
+ Func,
+ Value,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum OuterAliasKind {
+ Module,
+ Component,
+ CoreType(Rc<CoreType>),
+ Type(Rc<Type>),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct ComponentType {
+ defs: Vec<ComponentTypeDef>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum ComponentTypeDef {
+ CoreType(Rc<CoreType>),
+ Type(Rc<Type>),
+ Alias(Alias),
+ Import(Import),
+ Export {
+ name: String,
+ url: Option<String>,
+ ty: ComponentTypeRef,
+ },
+}
+
+impl From<InstanceTypeDecl> for ComponentTypeDef {
+ fn from(def: InstanceTypeDecl) -> Self {
+ match def {
+ InstanceTypeDecl::CoreType(t) => Self::CoreType(t),
+ InstanceTypeDecl::Type(t) => Self::Type(t),
+ InstanceTypeDecl::Export { name, url, ty } => Self::Export { name, url, ty },
+ InstanceTypeDecl::Alias(a) => Self::Alias(a),
+ }
+ }
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct InstanceType {
+ defs: Vec<InstanceTypeDecl>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum InstanceTypeDecl {
+ CoreType(Rc<CoreType>),
+ Type(Rc<Type>),
+ Alias(Alias),
+ Export {
+ name: String,
+ url: Option<String>,
+ ty: ComponentTypeRef,
+ },
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct FuncType {
+ params: Vec<(String, ComponentValType)>,
+ results: Vec<(Option<String>, ComponentValType)>,
+}
+
+impl FuncType {
+ fn unnamed_result_ty(&self) -> Option<ComponentValType> {
+ if self.results.len() == 1 {
+ let (name, ty) = &self.results[0];
+ if name.is_none() {
+ return Some(*ty);
+ }
+ }
+ None
+ }
+
+ fn is_scalar(&self) -> bool {
+ self.params.iter().all(|(_, ty)| is_scalar(ty))
+ && self.results.len() == 1
+ && is_scalar(&self.results[0].1)
+ }
+}
+
+fn is_scalar(ty: &ComponentValType) -> bool {
+ match ty {
+ ComponentValType::Primitive(prim) => match prim {
+ PrimitiveValType::Bool
+ | PrimitiveValType::S8
+ | PrimitiveValType::U8
+ | PrimitiveValType::S16
+ | PrimitiveValType::U16
+ | PrimitiveValType::S32
+ | PrimitiveValType::U32
+ | PrimitiveValType::S64
+ | PrimitiveValType::U64
+ | PrimitiveValType::Float32
+ | PrimitiveValType::Float64
+ | PrimitiveValType::Char => true,
+ PrimitiveValType::String => false,
+ },
+ ComponentValType::Type(_) => false,
+ }
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+enum DefinedType {
+ Primitive(PrimitiveValType),
+ Record(RecordType),
+ Variant(VariantType),
+ List(ListType),
+ Tuple(TupleType),
+ Flags(FlagsType),
+ Enum(EnumType),
+ Option(OptionType),
+ Result(ResultType),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct RecordType {
+ fields: Vec<(String, ComponentValType)>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct VariantType {
+ cases: Vec<(String, Option<ComponentValType>, Option<u32>)>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct ListType {
+ elem_ty: ComponentValType,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct TupleType {
+ fields: Vec<ComponentValType>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct FlagsType {
+ fields: Vec<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct EnumType {
+ variants: Vec<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct OptionType {
+ inner_ty: ComponentValType,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct ResultType {
+ ok_ty: Option<ComponentValType>,
+ err_ty: Option<ComponentValType>,
+}
+
+#[derive(Debug)]
+struct ImportSection {
+ imports: Vec<Import>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+struct Import {
+ name: String,
+ url: Option<String>,
+ ty: ComponentTypeRef,
+}
+
+#[derive(Debug)]
+struct CanonicalSection {
+ funcs: Vec<Func>,
+}
+
+#[derive(Debug)]
+enum Func {
+ CanonLift {
+ func_ty: u32,
+ options: Vec<CanonOpt>,
+ core_func_index: u32,
+ },
+ CanonLower {
+ options: Vec<CanonOpt>,
+ func_index: u32,
+ },
+}
+
+#[derive(Debug)]
+enum CanonOpt {
+ StringUtf8,
+ StringUtf16,
+ StringLatin1Utf16,
+ Memory(u32),
+ Realloc(u32),
+ PostReturn(u32),
+}
+
+#[derive(Debug)]
+struct InstanceSection {}
+
+#[derive(Debug)]
+struct ExportSection {}
+
+#[derive(Debug)]
+struct StartSection {}
+
+#[derive(Debug)]
+struct AliasSection {}
+
+#[derive(Debug)]
+struct CoreInstanceSection {}
+
+#[derive(Debug)]
+struct CoreTypeSection {
+ types: Vec<Rc<CoreType>>,
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-14 04:21:07 +0000