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Implement nested instance exports for components (#4364)

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This commit adds support to Wasmtime for components which themselves
export instances. The support here adds new APIs for how instance
exports are accessed in the embedding API. For now this is mostly just a
first-pass where the API is somewhat confusing and has a lot of
lifetimes. I'm hoping that over time we can figure out how to simplify
this but for now it should at least be expressive enough for exploring
the exports of an instance.
This commit is contained in:
Alex Crichton
2022-07-05 11:04:54 -05:00
committed by GitHub
parent 2003ae99a0
commit 76a2545a7f
10 changed files with 431 additions and 146 deletions
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188
crates/environ/src/component/translate/inline.rs
View File

@@ -50,7 +50,7 @@ use crate::{ModuleTranslation, PrimaryMap, SignatureIndex};
use indexmap::IndexMap;
pub(super) fn run(
types: &mut ComponentTypesBuilder,
types: &ComponentTypesBuilder,
result: &Translation<'_>,
nested_modules: &PrimaryMap<StaticModuleIndex, ModuleTranslation<'_>>,
nested_components: &PrimaryMap<StaticComponentIndex, Translation<'_>>,
@@ -82,23 +82,7 @@ pub(super) fn run(
};
let index = inliner.result.import_types.push((name.to_string(), ty));
let path = ImportPath::root(index);
args.insert(
name,
match ty {
TypeDef::Module(ty) => ComponentItemDef::Module(ModuleDef::Import(path, ty)),
TypeDef::ComponentInstance(ty) => {
ComponentItemDef::Instance(ComponentInstanceDef::Import(path, ty))
}
TypeDef::ComponentFunc(_ty) => {
ComponentItemDef::Func(ComponentFuncDef::Import(path))
}
// FIXME(#4283) should commit one way or another to how this
// should be treated.
TypeDef::Component(_ty) => bail!("root-level component imports are not supported"),
TypeDef::Interface(_ty) => unimplemented!("import of a type"),
TypeDef::CoreFunc(_ty) => unreachable!(),
},
);
args.insert(name, ComponentItemDef::from_import(path, ty)?);
}
// This will run the inliner to completion after being seeded with the
@@ -116,58 +100,18 @@ pub(super) fn run(
let exports = inliner.run(&mut frames)?;
assert!(frames.is_empty());
let mut export_map = Default::default();
for (name, def) in exports {
let export = match def {
// Exported modules are currently saved in a `PrimaryMap`, at
// runtime, so an index (`RuntimeModuleIndex`) is assigned here and
// then an initializer is recorded about where the module comes
// from.
ComponentItemDef::Module(module) => {
let index = RuntimeModuleIndex::from_u32(inliner.result.num_runtime_modules);
inliner.result.num_runtime_modules += 1;
let init = match module {
ModuleDef::Static(idx) => GlobalInitializer::SaveStaticModule(idx),
ModuleDef::Import(path, _) => {
GlobalInitializer::SaveModuleImport(inliner.runtime_import(&path))
}
};
inliner.result.initializers.push(init);
Export::Module(index)
}
// Currently only exported functions through liftings are supported
// which simply record the various lifting options here which get
// processed at runtime.
ComponentItemDef::Func(func) => match func {
ComponentFuncDef::Lifted { ty, func, options } => {
Export::LiftedFunction { ty, func, options }
}
ComponentFuncDef::Import(_) => {
bail!("component export `{name}` is a reexport of an imported function which is not implemented")
}
},
ComponentItemDef::Instance(_) => unimplemented!("exporting an instance to the host"),
// FIXME(#4283) should make an official decision on whether this is
// the final treatment of this or not.
ComponentItemDef::Component(_) => {
bail!("exporting a component from the root component is not supported")
}
};
inliner.result.exports.insert(name.to_string(), export);
inliner.record_export(name, def, &mut export_map)?;
}
inliner.result.exports = export_map;
Ok(inliner.result)
}
struct Inliner<'a> {
/// Global type information for the entire component.
///
/// Note that the mutability is used here to register a `SignatureIndex` for
/// the wasm function signature of lowered imports.
types: &'a mut ComponentTypesBuilder,
types: &'a ComponentTypesBuilder,
/// The list of static modules that were found during initial translation of
/// the component.
@@ -445,24 +389,7 @@ impl<'a> Inliner<'a> {
//
// NB: at this time only lowered imported functions are supported.
Lower(func, options) => {
// Use the type information from `wasmparser` to lookup the core
// wasm function signature of the lowered function. This avoids
// us having to reimplement the
// translate-interface-types-to-the-canonical-abi logic. The
// type of the function is then intern'd to get a
// `SignatureIndex` which is later used at runtime for a
// `VMSharedSignatureIndex`.
let lowered_function_type = frame
.translation
.types
.as_ref()
.unwrap()
.function_at(frame.funcs.next_key().as_u32())
.expect("should be in-bounds");
let canonical_abi = self
.types
.module_types_builder()
.wasm_func_type(lowered_function_type.clone().try_into()?);
let canonical_abi = frame.translation.funcs[frame.funcs.next_key()];
let options_lower = self.canonical_options(frame, options);
let func = match &frame.component_funcs[*func] {
@@ -937,6 +864,89 @@ impl<'a> Inliner<'a> {
post_return,
}
}
fn record_export(
&mut self,
name: &str,
def: ComponentItemDef<'a>,
map: &mut IndexMap<String, Export>,
) -> Result<()> {
let export = match def {
// Exported modules are currently saved in a `PrimaryMap`, at
// runtime, so an index (`RuntimeModuleIndex`) is assigned here and
// then an initializer is recorded about where the module comes
// from.
ComponentItemDef::Module(module) => {
let index = RuntimeModuleIndex::from_u32(self.result.num_runtime_modules);
self.result.num_runtime_modules += 1;
let init = match module {
ModuleDef::Static(idx) => GlobalInitializer::SaveStaticModule(idx),
ModuleDef::Import(path, _) => {
GlobalInitializer::SaveModuleImport(self.runtime_import(&path))
}
};
self.result.initializers.push(init);
Export::Module(index)
}
ComponentItemDef::Func(func) => match func {
// If this is a lifted function from something lowered in this
// component then the configured options are plumbed through
// here.
ComponentFuncDef::Lifted { ty, func, options } => {
Export::LiftedFunction { ty, func, options }
}
// Currently reexported functions from an import are not
// supported. Being able to actually call these functions is
// somewhat tricky and needs something like temporary scratch
// space that isn't implemented.
ComponentFuncDef::Import(_) => {
bail!("component export `{name}` is a reexport of an imported function which is not implemented")
}
},
ComponentItemDef::Instance(instance) => {
let mut result = IndexMap::new();
match instance {
// If this instance is one that was originally imported by
// the component itself then the imports are translated here
// by converting to a `ComponentItemDef` and then
// recursively recording the export as a reexport.
//
// Note that for now this would only work with
// module-exporting instances.
ComponentInstanceDef::Import(path, ty) => {
for (name, ty) in self.types[ty].exports.iter() {
let mut path = path.clone();
path.path.push(name);
let def = ComponentItemDef::from_import(path, *ty)?;
self.record_export(name, def, &mut result)?;
}
}
// An exported instance which is itself a bag of items is
// translated recursively here to our `result` map which is
// the bag of items we're exporting.
ComponentInstanceDef::Items(map) => {
for (name, def) in map {
self.record_export(name, def, &mut result)?;
}
}
}
Export::Instance(result)
}
// FIXME(#4283) should make an official decision on whether this is
// the final treatment of this or not.
ComponentItemDef::Component(_) => {
bail!("exporting a component from the root component is not supported")
}
};
map.insert(name.to_string(), export);
Ok(())
}
}
impl<'a> InlinerFrame<'a> {
@@ -1004,3 +1014,21 @@ impl<'a> ImportPath<'a> {
}
}
}
impl<'a> ComponentItemDef<'a> {
fn from_import(path: ImportPath<'a>, ty: TypeDef) -> Result<ComponentItemDef<'a>> {
let item = match ty {
TypeDef::Module(ty) => ComponentItemDef::Module(ModuleDef::Import(path, ty)),
TypeDef::ComponentInstance(ty) => {
ComponentItemDef::Instance(ComponentInstanceDef::Import(path, ty))
}
TypeDef::ComponentFunc(_ty) => ComponentItemDef::Func(ComponentFuncDef::Import(path)),
// FIXME(#4283) should commit one way or another to how this
// should be treated.
TypeDef::Component(_ty) => bail!("root-level component imports are not supported"),
TypeDef::Interface(_ty) => unimplemented!("import of a type"),
TypeDef::CoreFunc(_ty) => unreachable!(),
};
Ok(item)
}
}