wasmtime_environ/component/types.rs
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use crate::component::{MAX_FLAT_PARAMS, MAX_FLAT_RESULTS};
use crate::prelude::*;
use crate::{EntityType, ModuleInternedTypeIndex, ModuleTypes, PrimaryMap};
use core::hash::{Hash, Hasher};
use core::ops::Index;
use serde_derive::{Deserialize, Serialize};
use wasmparser::component_types::ComponentAnyTypeId;
use wasmtime_component_util::{DiscriminantSize, FlagsSize};
pub use crate::StaticModuleIndex;
macro_rules! indices {
($(
$(#[$a:meta])*
pub struct $name:ident(u32);
)*) => ($(
$(#[$a])*
#[derive(
Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug,
Serialize, Deserialize,
)]
#[repr(transparent)]
pub struct $name(u32);
cranelift_entity::entity_impl!($name);
)*);
}
indices! {
// ========================================================================
// These indices are used during compile time only when we're translating a
// component at this time. The actual indices are not persisted beyond the
// compile phase to when we're actually working with the component at
// runtime.
/// Index within a component's component type index space.
pub struct ComponentTypeIndex(u32);
/// Index within a component's module index space.
pub struct ModuleIndex(u32);
/// Index within a component's component index space.
pub struct ComponentIndex(u32);
/// Index within a component's module instance index space.
pub struct ModuleInstanceIndex(u32);
/// Index within a component's component instance index space.
pub struct ComponentInstanceIndex(u32);
/// Index within a component's component function index space.
pub struct ComponentFuncIndex(u32);
// ========================================================================
// These indices are used to lookup type information within a `TypeTables`
// structure. These represent generally deduplicated type information across
// an entire component and are a form of RTTI in a sense.
/// Index pointing to a component's type (exports/imports with
/// component-model types)
pub struct TypeComponentIndex(u32);
/// Index pointing to a component instance's type (exports with
/// component-model types, no imports)
pub struct TypeComponentInstanceIndex(u32);
/// Index pointing to a core wasm module's type (exports/imports with
/// core wasm types)
pub struct TypeModuleIndex(u32);
/// Index pointing to a component model function type with arguments/result
/// as interface types.
pub struct TypeFuncIndex(u32);
/// Index pointing to a record type in the component model (aka a struct).
pub struct TypeRecordIndex(u32);
/// Index pointing to a variant type in the component model (aka an enum).
pub struct TypeVariantIndex(u32);
/// Index pointing to a tuple type in the component model.
pub struct TypeTupleIndex(u32);
/// Index pointing to a flags type in the component model.
pub struct TypeFlagsIndex(u32);
/// Index pointing to an enum type in the component model.
pub struct TypeEnumIndex(u32);
/// Index pointing to an option type in the component model (aka a
/// `Option<T, E>`)
pub struct TypeOptionIndex(u32);
/// Index pointing to an result type in the component model (aka a
/// `Result<T, E>`)
pub struct TypeResultIndex(u32);
/// Index pointing to a list type in the component model.
pub struct TypeListIndex(u32);
/// Index pointing to a resource table within a component.
///
/// This is a Wasmtime-specific type index which isn't part of the component
/// model per-se (or at least not the binary format). This index represents
/// a pointer to a table of runtime information tracking state for resources
/// within a component. Tables are generated per-resource-per-component
/// meaning that if the exact same resource is imported into 4 subcomponents
/// then that's 5 tables: one for the defining component and one for each
/// subcomponent.
///
/// All resource-related intrinsics operate on table-local indices which
/// indicate which table the intrinsic is modifying. Each resource table has
/// an origin resource type (defined by `ResourceIndex`) along with a
/// component instance that it's recorded for.
pub struct TypeResourceTableIndex(u32);
/// Index pointing to a resource within a component.
///
/// This index space covers all unique resource type definitions. For
/// example all unique imports come first and then all locally-defined
/// resources come next. Note that this does not count the number of runtime
/// tables required to track resources (that's `TypeResourceTableIndex`
/// instead). Instead this is a count of the number of unique
/// `(type (resource (rep ..)))` declarations within a component, plus
/// imports.
///
/// This is then used for correlating various information such as
/// destructors, origin information, etc.
pub struct ResourceIndex(u32);
/// Index pointing to a local resource defined within a component.
///
/// This is similar to `FooIndex` and `DefinedFooIndex` for core wasm and
/// the idea here is that this is guaranteed to be a wasm-defined resource
/// which is connected to a component instance for example.
pub struct DefinedResourceIndex(u32);
// ========================================================================
// Index types used to identify modules and components during compilation.
/// Index into a "closed over variables" list for components used to
/// implement outer aliases. For more information on this see the
/// documentation for the `LexicalScope` structure.
pub struct ModuleUpvarIndex(u32);
/// Same as `ModuleUpvarIndex` but for components.
pub struct ComponentUpvarIndex(u32);
/// Same as `StaticModuleIndex` but for components.
pub struct StaticComponentIndex(u32);
// ========================================================================
// These indices are actually used at runtime when managing a component at
// this time.
/// Index that represents a core wasm instance created at runtime.
///
/// This is used to keep track of when instances are created and is able to
/// refer back to previously created instances for exports and such.
pub struct RuntimeInstanceIndex(u32);
/// Same as `RuntimeInstanceIndex` but tracks component instances instead.
pub struct RuntimeComponentInstanceIndex(u32);
/// Used to index imports into a `Component`
///
/// This does not correspond to anything in the binary format for the
/// component model.
pub struct ImportIndex(u32);
/// Index that represents a leaf item imported into a component where a
/// "leaf" means "not an instance".
///
/// This does not correspond to anything in the binary format for the
/// component model.
pub struct RuntimeImportIndex(u32);
/// Index that represents a lowered host function and is used to represent
/// host function lowerings with options and such.
///
/// This does not correspond to anything in the binary format for the
/// component model.
pub struct LoweredIndex(u32);
/// Index representing a linear memory extracted from a wasm instance
/// which is stored in a `VMComponentContext`. This is used to deduplicate
/// references to the same linear memory where it's only stored once in a
/// `VMComponentContext`.
///
/// This does not correspond to anything in the binary format for the
/// component model.
pub struct RuntimeMemoryIndex(u32);
/// Same as `RuntimeMemoryIndex` except for the `realloc` function.
pub struct RuntimeReallocIndex(u32);
/// Same as `RuntimeMemoryIndex` except for the `post-return` function.
pub struct RuntimePostReturnIndex(u32);
/// Index for all trampolines that are compiled in Cranelift for a
/// component.
///
/// This is used to point to various bits of metadata within a compiled
/// component and is stored in the final compilation artifact. This does not
/// have a direct corresponance to any wasm definition.
pub struct TrampolineIndex(u32);
/// An index into `Component::export_items` at the end of compilation.
pub struct ExportIndex(u32);
}
// Reexport for convenience some core-wasm indices which are also used in the
// component model, typically for when aliasing exports of core wasm modules.
pub use crate::{FuncIndex, GlobalIndex, MemoryIndex, TableIndex};
/// Equivalent of `EntityIndex` but for the component model instead of core
/// wasm.
#[derive(Debug, Clone, Copy)]
#[allow(missing_docs)]
pub enum ComponentItem {
Func(ComponentFuncIndex),
Module(ModuleIndex),
Component(ComponentIndex),
ComponentInstance(ComponentInstanceIndex),
Type(ComponentAnyTypeId),
}
/// Runtime information about the type information contained within a component.
///
/// One of these is created per top-level component which describes all of the
/// types contained within the top-level component itself. Each sub-component
/// will have a pointer to this value as well.
#[derive(Default, Serialize, Deserialize)]
pub struct ComponentTypes {
pub(super) modules: PrimaryMap<TypeModuleIndex, TypeModule>,
pub(super) components: PrimaryMap<TypeComponentIndex, TypeComponent>,
pub(super) component_instances: PrimaryMap<TypeComponentInstanceIndex, TypeComponentInstance>,
pub(super) functions: PrimaryMap<TypeFuncIndex, TypeFunc>,
pub(super) lists: PrimaryMap<TypeListIndex, TypeList>,
pub(super) records: PrimaryMap<TypeRecordIndex, TypeRecord>,
pub(super) variants: PrimaryMap<TypeVariantIndex, TypeVariant>,
pub(super) tuples: PrimaryMap<TypeTupleIndex, TypeTuple>,
pub(super) enums: PrimaryMap<TypeEnumIndex, TypeEnum>,
pub(super) flags: PrimaryMap<TypeFlagsIndex, TypeFlags>,
pub(super) options: PrimaryMap<TypeOptionIndex, TypeOption>,
pub(super) results: PrimaryMap<TypeResultIndex, TypeResult>,
pub(super) resource_tables: PrimaryMap<TypeResourceTableIndex, TypeResourceTable>,
pub(super) module_types: Option<ModuleTypes>,
}
impl ComponentTypes {
/// Returns the core wasm module types known within this component.
pub fn module_types(&self) -> &ModuleTypes {
self.module_types.as_ref().unwrap()
}
/// Returns the canonical ABI information about the specified type.
pub fn canonical_abi(&self, ty: &InterfaceType) -> &CanonicalAbiInfo {
match ty {
InterfaceType::U8 | InterfaceType::S8 | InterfaceType::Bool => {
&CanonicalAbiInfo::SCALAR1
}
InterfaceType::U16 | InterfaceType::S16 => &CanonicalAbiInfo::SCALAR2,
InterfaceType::U32
| InterfaceType::S32
| InterfaceType::Float32
| InterfaceType::Char
| InterfaceType::Own(_)
| InterfaceType::Borrow(_) => &CanonicalAbiInfo::SCALAR4,
InterfaceType::U64 | InterfaceType::S64 | InterfaceType::Float64 => {
&CanonicalAbiInfo::SCALAR8
}
InterfaceType::String | InterfaceType::List(_) => &CanonicalAbiInfo::POINTER_PAIR,
InterfaceType::Record(i) => &self[*i].abi,
InterfaceType::Variant(i) => &self[*i].abi,
InterfaceType::Tuple(i) => &self[*i].abi,
InterfaceType::Flags(i) => &self[*i].abi,
InterfaceType::Enum(i) => &self[*i].abi,
InterfaceType::Option(i) => &self[*i].abi,
InterfaceType::Result(i) => &self[*i].abi,
}
}
/// Adds a new `table` to the list of resource tables for this component.
pub fn push_resource_table(&mut self, table: TypeResourceTable) -> TypeResourceTableIndex {
self.resource_tables.push(table)
}
}
macro_rules! impl_index {
($(impl Index<$ty:ident> for ComponentTypes { $output:ident => $field:ident })*) => ($(
impl core::ops::Index<$ty> for ComponentTypes {
type Output = $output;
#[inline]
fn index(&self, idx: $ty) -> &$output {
&self.$field[idx]
}
}
#[cfg(feature = "compile")]
impl core::ops::Index<$ty> for super::ComponentTypesBuilder {
type Output = $output;
#[inline]
fn index(&self, idx: $ty) -> &$output {
&self.component_types()[idx]
}
}
)*)
}
impl_index! {
impl Index<TypeModuleIndex> for ComponentTypes { TypeModule => modules }
impl Index<TypeComponentIndex> for ComponentTypes { TypeComponent => components }
impl Index<TypeComponentInstanceIndex> for ComponentTypes { TypeComponentInstance => component_instances }
impl Index<TypeFuncIndex> for ComponentTypes { TypeFunc => functions }
impl Index<TypeRecordIndex> for ComponentTypes { TypeRecord => records }
impl Index<TypeVariantIndex> for ComponentTypes { TypeVariant => variants }
impl Index<TypeTupleIndex> for ComponentTypes { TypeTuple => tuples }
impl Index<TypeEnumIndex> for ComponentTypes { TypeEnum => enums }
impl Index<TypeFlagsIndex> for ComponentTypes { TypeFlags => flags }
impl Index<TypeOptionIndex> for ComponentTypes { TypeOption => options }
impl Index<TypeResultIndex> for ComponentTypes { TypeResult => results }
impl Index<TypeListIndex> for ComponentTypes { TypeList => lists }
impl Index<TypeResourceTableIndex> for ComponentTypes { TypeResourceTable => resource_tables }
}
// Additionally forward anything that can index `ModuleTypes` to `ModuleTypes`
// (aka `SignatureIndex`)
impl<T> Index<T> for ComponentTypes
where
ModuleTypes: Index<T>,
{
type Output = <ModuleTypes as Index<T>>::Output;
fn index(&self, idx: T) -> &Self::Output {
self.module_types.as_ref().unwrap().index(idx)
}
}
/// Types of imports and exports in the component model.
///
/// These types are what's available for import and export in components. Note
/// that all indirect indices contained here are intended to be looked up
/// through a sibling `ComponentTypes` structure.
#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
pub enum TypeDef {
/// A component and its type.
Component(TypeComponentIndex),
/// An instance of a component.
ComponentInstance(TypeComponentInstanceIndex),
/// A component function, not to be confused with a core wasm function.
ComponentFunc(TypeFuncIndex),
/// An type in an interface.
Interface(InterfaceType),
/// A core wasm module and its type.
Module(TypeModuleIndex),
/// A core wasm function using only core wasm types.
CoreFunc(ModuleInternedTypeIndex),
/// A resource type which operates on the specified resource table.
///
/// Note that different resource tables may point to the same underlying
/// actual resource type, but that's a private detail.
Resource(TypeResourceTableIndex),
}
impl TypeDef {
/// A human readable description of what kind of type definition this is.
pub fn desc(&self) -> &str {
match self {
TypeDef::Component(_) => "component",
TypeDef::ComponentInstance(_) => "instance",
TypeDef::ComponentFunc(_) => "function",
TypeDef::Interface(_) => "type",
TypeDef::Module(_) => "core module",
TypeDef::CoreFunc(_) => "core function",
TypeDef::Resource(_) => "resource",
}
}
}
// NB: Note that maps below are stored as an `IndexMap` now but the order
// typically does not matter. As a minor implementation detail we want the
// serialization of this type to always be deterministic and using `IndexMap`
// gets us that over using a `HashMap` for example.
/// The type of a module in the component model.
///
/// Note that this is not to be confused with `TypeComponent` below. This is
/// intended only for core wasm modules, not for components.
#[derive(Serialize, Deserialize, Default)]
pub struct TypeModule {
/// The values that this module imports.
///
/// Note that the value of this map is a core wasm `EntityType`, not a
/// component model `TypeRef`. Additionally note that this reflects the
/// two-level namespace of core WebAssembly, but unlike core wasm all import
/// names are required to be unique to describe a module in the component
/// model.
pub imports: IndexMap<(String, String), EntityType>,
/// The values that this module exports.
///
/// Note that the value of this map is the core wasm `EntityType` to
/// represent that core wasm items are being exported.
pub exports: IndexMap<String, EntityType>,
}
/// The type of a component in the component model.
#[derive(Serialize, Deserialize, Default)]
pub struct TypeComponent {
/// The named values that this component imports.
pub imports: IndexMap<String, TypeDef>,
/// The named values that this component exports.
pub exports: IndexMap<String, TypeDef>,
}
/// The type of a component instance in the component model, or an instantiated
/// component.
///
/// Component instances only have exports of types in the component model.
#[derive(Serialize, Deserialize, Default)]
pub struct TypeComponentInstance {
/// The list of exports that this component has along with their types.
pub exports: IndexMap<String, TypeDef>,
}
/// A component function type in the component model.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct TypeFunc {
/// Names of parameters.
pub param_names: Vec<String>,
/// Parameters to the function represented as a tuple.
pub params: TypeTupleIndex,
/// Results of the function represented as a tuple.
pub results: TypeTupleIndex,
}
/// All possible interface types that values can have.
///
/// This list represents an exhaustive listing of interface types and the
/// shapes that they can take. Note that this enum is considered an "index" of
/// forms where for non-primitive types a `ComponentTypes` structure is used to
/// lookup further information based on the index found here.
#[derive(Serialize, Deserialize, Copy, Clone, Hash, Eq, PartialEq, Debug)]
#[allow(missing_docs)]
pub enum InterfaceType {
Bool,
S8,
U8,
S16,
U16,
S32,
U32,
S64,
U64,
Float32,
Float64,
Char,
String,
Record(TypeRecordIndex),
Variant(TypeVariantIndex),
List(TypeListIndex),
Tuple(TypeTupleIndex),
Flags(TypeFlagsIndex),
Enum(TypeEnumIndex),
Option(TypeOptionIndex),
Result(TypeResultIndex),
Own(TypeResourceTableIndex),
Borrow(TypeResourceTableIndex),
}
impl From<&wasmparser::PrimitiveValType> for InterfaceType {
fn from(ty: &wasmparser::PrimitiveValType) -> InterfaceType {
match ty {
wasmparser::PrimitiveValType::Bool => InterfaceType::Bool,
wasmparser::PrimitiveValType::S8 => InterfaceType::S8,
wasmparser::PrimitiveValType::U8 => InterfaceType::U8,
wasmparser::PrimitiveValType::S16 => InterfaceType::S16,
wasmparser::PrimitiveValType::U16 => InterfaceType::U16,
wasmparser::PrimitiveValType::S32 => InterfaceType::S32,
wasmparser::PrimitiveValType::U32 => InterfaceType::U32,
wasmparser::PrimitiveValType::S64 => InterfaceType::S64,
wasmparser::PrimitiveValType::U64 => InterfaceType::U64,
wasmparser::PrimitiveValType::F32 => InterfaceType::Float32,
wasmparser::PrimitiveValType::F64 => InterfaceType::Float64,
wasmparser::PrimitiveValType::Char => InterfaceType::Char,
wasmparser::PrimitiveValType::String => InterfaceType::String,
}
}
}
/// Bye information about a type in the canonical ABI, with metadata for both
/// memory32 and memory64-based types.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct CanonicalAbiInfo {
/// The byte-size of this type in a 32-bit memory.
pub size32: u32,
/// The byte-alignment of this type in a 32-bit memory.
pub align32: u32,
/// The byte-size of this type in a 64-bit memory.
pub size64: u32,
/// The byte-alignment of this type in a 64-bit memory.
pub align64: u32,
/// The number of types it takes to represents this type in the "flat"
/// representation of the canonical abi where everything is passed as
/// immediate arguments or results.
///
/// If this is `None` then this type is not representable in the flat ABI
/// because it is too large.
pub flat_count: Option<u8>,
}
impl Default for CanonicalAbiInfo {
fn default() -> CanonicalAbiInfo {
CanonicalAbiInfo {
size32: 0,
align32: 1,
size64: 0,
align64: 1,
flat_count: Some(0),
}
}
}
const fn align_to(a: u32, b: u32) -> u32 {
assert!(b.is_power_of_two());
(a + (b - 1)) & !(b - 1)
}
const fn max(a: u32, b: u32) -> u32 {
if a > b {
a
} else {
b
}
}
impl CanonicalAbiInfo {
/// ABI information for zero-sized types.
const ZERO: CanonicalAbiInfo = CanonicalAbiInfo {
size32: 0,
align32: 1,
size64: 0,
align64: 1,
flat_count: Some(0),
};
/// ABI information for one-byte scalars.
pub const SCALAR1: CanonicalAbiInfo = CanonicalAbiInfo::scalar(1);
/// ABI information for two-byte scalars.
pub const SCALAR2: CanonicalAbiInfo = CanonicalAbiInfo::scalar(2);
/// ABI information for four-byte scalars.
pub const SCALAR4: CanonicalAbiInfo = CanonicalAbiInfo::scalar(4);
/// ABI information for eight-byte scalars.
pub const SCALAR8: CanonicalAbiInfo = CanonicalAbiInfo::scalar(8);
const fn scalar(size: u32) -> CanonicalAbiInfo {
CanonicalAbiInfo {
size32: size,
align32: size,
size64: size,
align64: size,
flat_count: Some(1),
}
}
/// ABI information for lists/strings which are "pointer pairs"
pub const POINTER_PAIR: CanonicalAbiInfo = CanonicalAbiInfo {
size32: 8,
align32: 4,
size64: 16,
align64: 8,
flat_count: Some(2),
};
/// Returns the abi for a record represented by the specified fields.
pub fn record<'a>(fields: impl Iterator<Item = &'a CanonicalAbiInfo>) -> CanonicalAbiInfo {
// NB: this is basically a duplicate copy of
// `CanonicalAbiInfo::record_static` and the two should be kept in sync.
let mut ret = CanonicalAbiInfo::default();
for field in fields {
ret.size32 = align_to(ret.size32, field.align32) + field.size32;
ret.align32 = ret.align32.max(field.align32);
ret.size64 = align_to(ret.size64, field.align64) + field.size64;
ret.align64 = ret.align64.max(field.align64);
ret.flat_count = add_flat(ret.flat_count, field.flat_count);
}
ret.size32 = align_to(ret.size32, ret.align32);
ret.size64 = align_to(ret.size64, ret.align64);
return ret;
}
/// Same as `CanonicalAbiInfo::record` but in a `const`-friendly context.
pub const fn record_static(fields: &[CanonicalAbiInfo]) -> CanonicalAbiInfo {
// NB: this is basically a duplicate copy of `CanonicalAbiInfo::record`
// and the two should be kept in sync.
let mut ret = CanonicalAbiInfo::ZERO;
let mut i = 0;
while i < fields.len() {
let field = &fields[i];
ret.size32 = align_to(ret.size32, field.align32) + field.size32;
ret.align32 = max(ret.align32, field.align32);
ret.size64 = align_to(ret.size64, field.align64) + field.size64;
ret.align64 = max(ret.align64, field.align64);
ret.flat_count = add_flat(ret.flat_count, field.flat_count);
i += 1;
}
ret.size32 = align_to(ret.size32, ret.align32);
ret.size64 = align_to(ret.size64, ret.align64);
return ret;
}
/// Returns the delta from the current value of `offset` to align properly
/// and read the next record field of type `abi` for 32-bit memories.
pub fn next_field32(&self, offset: &mut u32) -> u32 {
*offset = align_to(*offset, self.align32) + self.size32;
*offset - self.size32
}
/// Same as `next_field32`, but bumps a usize pointer
pub fn next_field32_size(&self, offset: &mut usize) -> usize {
let cur = u32::try_from(*offset).unwrap();
let cur = align_to(cur, self.align32) + self.size32;
*offset = usize::try_from(cur).unwrap();
usize::try_from(cur - self.size32).unwrap()
}
/// Returns the delta from the current value of `offset` to align properly
/// and read the next record field of type `abi` for 64-bit memories.
pub fn next_field64(&self, offset: &mut u32) -> u32 {
*offset = align_to(*offset, self.align64) + self.size64;
*offset - self.size64
}
/// Same as `next_field64`, but bumps a usize pointer
pub fn next_field64_size(&self, offset: &mut usize) -> usize {
let cur = u32::try_from(*offset).unwrap();
let cur = align_to(cur, self.align64) + self.size64;
*offset = usize::try_from(cur).unwrap();
usize::try_from(cur - self.size64).unwrap()
}
/// Returns ABI information for a structure which contains `count` flags.
pub const fn flags(count: usize) -> CanonicalAbiInfo {
let (size, align, flat_count) = match FlagsSize::from_count(count) {
FlagsSize::Size0 => (0, 1, 0),
FlagsSize::Size1 => (1, 1, 1),
FlagsSize::Size2 => (2, 2, 1),
FlagsSize::Size4Plus(n) => ((n as u32) * 4, 4, n),
};
CanonicalAbiInfo {
size32: size,
align32: align,
size64: size,
align64: align,
flat_count: Some(flat_count),
}
}
fn variant<'a, I>(cases: I) -> CanonicalAbiInfo
where
I: IntoIterator<Item = Option<&'a CanonicalAbiInfo>>,
I::IntoIter: ExactSizeIterator,
{
// NB: this is basically a duplicate definition of
// `CanonicalAbiInfo::variant_static`, these should be kept in sync.
let cases = cases.into_iter();
let discrim_size = u32::from(DiscriminantSize::from_count(cases.len()).unwrap());
let mut max_size32 = 0;
let mut max_align32 = discrim_size;
let mut max_size64 = 0;
let mut max_align64 = discrim_size;
let mut max_case_count = Some(0);
for case in cases {
if let Some(case) = case {
max_size32 = max_size32.max(case.size32);
max_align32 = max_align32.max(case.align32);
max_size64 = max_size64.max(case.size64);
max_align64 = max_align64.max(case.align64);
max_case_count = max_flat(max_case_count, case.flat_count);
}
}
CanonicalAbiInfo {
size32: align_to(
align_to(discrim_size, max_align32) + max_size32,
max_align32,
),
align32: max_align32,
size64: align_to(
align_to(discrim_size, max_align64) + max_size64,
max_align64,
),
align64: max_align64,
flat_count: add_flat(max_case_count, Some(1)),
}
}
/// Same as `CanonicalAbiInfo::variant` but `const`-safe
pub const fn variant_static(cases: &[Option<CanonicalAbiInfo>]) -> CanonicalAbiInfo {
// NB: this is basically a duplicate definition of
// `CanonicalAbiInfo::variant`, these should be kept in sync.
let discrim_size = match DiscriminantSize::from_count(cases.len()) {
Some(size) => size.byte_size(),
None => unreachable!(),
};
let mut max_size32 = 0;
let mut max_align32 = discrim_size;
let mut max_size64 = 0;
let mut max_align64 = discrim_size;
let mut max_case_count = Some(0);
let mut i = 0;
while i < cases.len() {
let case = &cases[i];
if let Some(case) = case {
max_size32 = max(max_size32, case.size32);
max_align32 = max(max_align32, case.align32);
max_size64 = max(max_size64, case.size64);
max_align64 = max(max_align64, case.align64);
max_case_count = max_flat(max_case_count, case.flat_count);
}
i += 1;
}
CanonicalAbiInfo {
size32: align_to(
align_to(discrim_size, max_align32) + max_size32,
max_align32,
),
align32: max_align32,
size64: align_to(
align_to(discrim_size, max_align64) + max_size64,
max_align64,
),
align64: max_align64,
flat_count: add_flat(max_case_count, Some(1)),
}
}
/// Calculates ABI information for an enum with `cases` cases.
pub const fn enum_(cases: usize) -> CanonicalAbiInfo {
// NB: this is basically a duplicate definition of
// `CanonicalAbiInfo::variant`, these should be kept in sync.
let discrim_size = match DiscriminantSize::from_count(cases) {
Some(size) => size.byte_size(),
None => unreachable!(),
};
CanonicalAbiInfo {
size32: discrim_size,
align32: discrim_size,
size64: discrim_size,
align64: discrim_size,
flat_count: Some(1),
}
}
/// Returns the flat count of this ABI information so long as the count
/// doesn't exceed the `max` specified.
pub fn flat_count(&self, max: usize) -> Option<usize> {
let flat = usize::from(self.flat_count?);
if flat > max {
None
} else {
Some(flat)
}
}
}
/// ABI information about the representation of a variant.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct VariantInfo {
/// The size of the discriminant used.
#[serde(with = "serde_discrim_size")]
pub size: DiscriminantSize,
/// The offset of the payload from the start of the variant in 32-bit
/// memories.
pub payload_offset32: u32,
/// The offset of the payload from the start of the variant in 64-bit
/// memories.
pub payload_offset64: u32,
}
impl VariantInfo {
/// Returns the abi information for a variant represented by the specified
/// cases.
pub fn new<'a, I>(cases: I) -> (VariantInfo, CanonicalAbiInfo)
where
I: IntoIterator<Item = Option<&'a CanonicalAbiInfo>>,
I::IntoIter: ExactSizeIterator,
{
let cases = cases.into_iter();
let size = DiscriminantSize::from_count(cases.len()).unwrap();
let abi = CanonicalAbiInfo::variant(cases);
(
VariantInfo {
size,
payload_offset32: align_to(u32::from(size), abi.align32),
payload_offset64: align_to(u32::from(size), abi.align64),
},
abi,
)
}
/// TODO
pub const fn new_static(cases: &[Option<CanonicalAbiInfo>]) -> VariantInfo {
let size = match DiscriminantSize::from_count(cases.len()) {
Some(size) => size,
None => unreachable!(),
};
let abi = CanonicalAbiInfo::variant_static(cases);
VariantInfo {
size,
payload_offset32: align_to(size.byte_size(), abi.align32),
payload_offset64: align_to(size.byte_size(), abi.align64),
}
}
}
mod serde_discrim_size {
use super::DiscriminantSize;
use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
pub fn serialize<S>(disc: &DiscriminantSize, ser: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
u32::from(*disc).serialize(ser)
}
pub fn deserialize<'de, D>(deser: D) -> Result<DiscriminantSize, D::Error>
where
D: Deserializer<'de>,
{
match u32::deserialize(deser)? {
1 => Ok(DiscriminantSize::Size1),
2 => Ok(DiscriminantSize::Size2),
4 => Ok(DiscriminantSize::Size4),
_ => Err(D::Error::custom("invalid discriminant size")),
}
}
}
/// Shape of a "record" type in interface types.
///
/// This is equivalent to a `struct` in Rust.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct TypeRecord {
/// The fields that are contained within this struct type.
pub fields: Box<[RecordField]>,
/// Byte information about this type in the canonical ABI.
pub abi: CanonicalAbiInfo,
}
/// One field within a record.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct RecordField {
/// The name of the field, unique amongst all fields in a record.
pub name: String,
/// The type that this field contains.
pub ty: InterfaceType,
}
/// Shape of a "variant" type in interface types.
///
/// Variants are close to Rust `enum` declarations where a value is one of many
/// cases and each case has a unique name and an optional payload associated
/// with it.
#[derive(Serialize, Deserialize, Clone, Eq, PartialEq, Debug)]
pub struct TypeVariant {
/// The list of cases that this variant can take.
pub cases: IndexMap<String, Option<InterfaceType>>,
/// Byte information about this type in the canonical ABI.
pub abi: CanonicalAbiInfo,
/// Byte information about this variant type.
pub info: VariantInfo,
}
impl Hash for TypeVariant {
fn hash<H: Hasher>(&self, h: &mut H) {
let TypeVariant { cases, abi, info } = self;
cases.len().hash(h);
for pair in cases {
pair.hash(h);
}
abi.hash(h);
info.hash(h);
}
}
/// Shape of a "tuple" type in interface types.
///
/// This is largely the same as a tuple in Rust, basically a record with
/// unnamed fields.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct TypeTuple {
/// The types that are contained within this tuple.
pub types: Box<[InterfaceType]>,
/// Byte information about this type in the canonical ABI.
pub abi: CanonicalAbiInfo,
}
/// Shape of a "flags" type in interface types.
///
/// This can be thought of as a record-of-bools, although the representation is
/// more efficient as bitflags.
#[derive(Serialize, Deserialize, Clone, Eq, PartialEq, Debug)]
pub struct TypeFlags {
/// The names of all flags, all of which are unique.
pub names: IndexSet<String>,
/// Byte information about this type in the canonical ABI.
pub abi: CanonicalAbiInfo,
}
impl Hash for TypeFlags {
fn hash<H: Hasher>(&self, h: &mut H) {
let TypeFlags { names, abi } = self;
names.len().hash(h);
for name in names {
name.hash(h);
}
abi.hash(h);
}
}
/// Shape of an "enum" type in interface types, not to be confused with a Rust
/// `enum` type.
///
/// In interface types enums are simply a bag of names, and can be seen as a
/// variant where all payloads are `Unit`.
#[derive(Serialize, Deserialize, Clone, Eq, PartialEq, Debug)]
pub struct TypeEnum {
/// The names of this enum, all of which are unique.
pub names: IndexSet<String>,
/// Byte information about this type in the canonical ABI.
pub abi: CanonicalAbiInfo,
/// Byte information about this variant type.
pub info: VariantInfo,
}
impl Hash for TypeEnum {
fn hash<H: Hasher>(&self, h: &mut H) {
let TypeEnum { names, abi, info } = self;
names.len().hash(h);
for name in names {
name.hash(h);
}
abi.hash(h);
info.hash(h);
}
}
/// Shape of an "option" interface type.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct TypeOption {
/// The `T` in `Result<T, E>`
pub ty: InterfaceType,
/// Byte information about this type in the canonical ABI.
pub abi: CanonicalAbiInfo,
/// Byte information about this variant type.
pub info: VariantInfo,
}
/// Shape of a "result" interface type.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct TypeResult {
/// The `T` in `Result<T, E>`
pub ok: Option<InterfaceType>,
/// The `E` in `Result<T, E>`
pub err: Option<InterfaceType>,
/// Byte information about this type in the canonical ABI.
pub abi: CanonicalAbiInfo,
/// Byte information about this variant type.
pub info: VariantInfo,
}
/// Metadata about a resource table added to a component.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct TypeResourceTable {
/// The original resource that this table contains.
///
/// This is used when destroying resources within this table since this
/// original definition will know how to execute destructors.
pub ty: ResourceIndex,
/// The component instance that contains this resource table.
pub instance: RuntimeComponentInstanceIndex,
}
/// Shape of a "list" interface type.
#[derive(Serialize, Deserialize, Clone, Hash, Eq, PartialEq, Debug)]
pub struct TypeList {
/// The element type of the list.
pub element: InterfaceType,
}
/// Maximum number of flat types, for either params or results.
pub const MAX_FLAT_TYPES: usize = if MAX_FLAT_PARAMS > MAX_FLAT_RESULTS {
MAX_FLAT_PARAMS
} else {
MAX_FLAT_RESULTS
};
const fn add_flat(a: Option<u8>, b: Option<u8>) -> Option<u8> {
const MAX: u8 = MAX_FLAT_TYPES as u8;
let sum = match (a, b) {
(Some(a), Some(b)) => match a.checked_add(b) {
Some(c) => c,
None => return None,
},
_ => return None,
};
if sum > MAX {
None
} else {
Some(sum)
}
}
const fn max_flat(a: Option<u8>, b: Option<u8>) -> Option<u8> {
match (a, b) {
(Some(a), Some(b)) => {
if a > b {
Some(a)
} else {
Some(b)
}
}
_ => None,
}
}
/// Flat representation of a type in just core wasm types.
pub struct FlatTypes<'a> {
/// The flat representation of this type in 32-bit memories.
pub memory32: &'a [FlatType],
/// The flat representation of this type in 64-bit memories.
pub memory64: &'a [FlatType],
}
#[allow(missing_docs)]
impl FlatTypes<'_> {
/// Returns the number of flat types used to represent this type.
///
/// Note that this length is the same regardless to the size of memory.
pub fn len(&self) -> usize {
assert_eq!(self.memory32.len(), self.memory64.len());
self.memory32.len()
}
}
// Note that this is intentionally duplicated here to keep the size to 1 byte
// regardless to changes in the core wasm type system since this will only
// ever use integers/floats for the foreseeable future.
#[derive(PartialEq, Eq, Copy, Clone)]
#[allow(missing_docs)]
pub enum FlatType {
I32,
I64,
F32,
F64,
}