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Update support for the module linking proposal

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This commit updates the various tooling used by wasmtime which has new
updates to the module linking proposal. This is done primarily to sync
with WebAssembly/module-linking#26. The main change implemented here is
that wasmtime now supports creating instances from a set of values, nott
just from instantiating a module. Additionally subtyping handling of
modules with respect to imports is now properly handled by desugaring
two-level imports to imports of instances.

A number of small refactorings are included here as well, but most of
them are in accordance with the changes to `wasmparser` and the updated
binary format for module linking.
This commit is contained in:
Alex Crichton
2021-01-12 10:44:11 -08:00
parent 705af0ac41
commit 703762c49e
45 changed files with 1041 additions and 747 deletions
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71
cranelift/wasm/src/sections_translator.rs
View File

@@ -504,19 +504,6 @@ pub fn parse_name_section<'data>(
Ok(())
}
/// Parses the Module section of the wasm module.
pub fn parse_module_section<'data>(
section: wasmparser::ModuleSectionReader<'data>,
environ: &mut dyn ModuleEnvironment<'data>,
) -> WasmResult<()> {
environ.reserve_modules(section.get_count());
for module_ty in section {
environ.declare_module(TypeIndex::from_u32(module_ty?))?;
}
Ok(())
}
/// Parses the Instance section of the wasm module.
pub fn parse_instance_section<'data>(
section: wasmparser::InstanceSectionReader<'data>,
@@ -530,20 +517,23 @@ pub fn parse_instance_section<'data>(
let args = instance
.args()?
.into_iter()
.map(|result| {
let (kind, idx) = result?;
Ok(match kind {
ExternalKind::Function => EntityIndex::Function(FuncIndex::from_u32(idx)),
ExternalKind::Table => EntityIndex::Table(TableIndex::from_u32(idx)),
ExternalKind::Memory => EntityIndex::Memory(MemoryIndex::from_u32(idx)),
ExternalKind::Global => EntityIndex::Global(GlobalIndex::from_u32(idx)),
ExternalKind::Module => EntityIndex::Module(ModuleIndex::from_u32(idx)),
ExternalKind::Instance => EntityIndex::Instance(InstanceIndex::from_u32(idx)),
.map(|arg| {
let arg = arg?;
let index = match arg.kind {
ExternalKind::Function => EntityIndex::Function(FuncIndex::from_u32(arg.index)),
ExternalKind::Table => EntityIndex::Table(TableIndex::from_u32(arg.index)),
ExternalKind::Memory => EntityIndex::Memory(MemoryIndex::from_u32(arg.index)),
ExternalKind::Global => EntityIndex::Global(GlobalIndex::from_u32(arg.index)),
ExternalKind::Module => EntityIndex::Module(ModuleIndex::from_u32(arg.index)),
ExternalKind::Instance => {
EntityIndex::Instance(InstanceIndex::from_u32(arg.index))
}
ExternalKind::Event => unimplemented!(),
// this won't pass validation
ExternalKind::Type => unreachable!(),
})
};
Ok((arg.name, index))
})
.collect::<WasmResult<Vec<_>>>()?;
environ.declare_instance(module, args)?;
@@ -557,19 +547,28 @@ pub fn parse_alias_section<'data>(
environ: &mut dyn ModuleEnvironment<'data>,
) -> WasmResult<()> {
for alias in section {
let alias = alias?;
let alias = match alias.instance {
wasmparser::AliasedInstance::Parent => {
match alias.kind {
ExternalKind::Module => Alias::ParentModule(ModuleIndex::from_u32(alias.index)),
ExternalKind::Type => Alias::ParentType(TypeIndex::from_u32(alias.index)),
// shouldn't get past validation
_ => unreachable!(),
}
}
wasmparser::AliasedInstance::Child(i) => Alias::Child {
instance: InstanceIndex::from_u32(i),
export: alias.index as usize,
let alias = match alias? {
wasmparser::Alias::OuterType {
relative_depth,
index,
} => Alias::OuterType {
relative_depth,
index: TypeIndex::from_u32(index),
},
wasmparser::Alias::OuterModule {
relative_depth,
index,
} => Alias::OuterModule {
relative_depth,
index: ModuleIndex::from_u32(index),
},
wasmparser::Alias::InstanceExport {
instance,
export,
kind: _,
} => Alias::InstanceExport {
instance: InstanceIndex::from_u32(instance),
export,
},
};
environ.declare_alias(alias)?;