df9c725fa0
This commit updates to the 0.9 version of the witx crate implemented in WebAssembly/wasi#395. This new version drastically changes code generation and how we interface with the crate. The intention is to abstract the code generation aspects and allow code generators to implement much more low-level instructions to enable more flexible APIs in the future. Additionally a bunch of `*.witx` files were updated in the WASI repository. It's worth pointing out, however, that `wasi-common` does not change as a result of this change. The shape of the APIs that we need to implement are effectively the same and the only difference is that the shim functions generated by wiggle are a bit different.
75 lines
1.9 KiB
Rust
75 lines
1.9 KiB
Rust
use proc_macro2::TokenStream;
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use quote::quote;
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pub trait LifetimeExt {
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fn is_transparent(&self) -> bool;
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fn needs_lifetime(&self) -> bool;
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}
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impl LifetimeExt for witx::TypeRef {
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fn is_transparent(&self) -> bool {
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self.type_().is_transparent()
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}
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fn needs_lifetime(&self) -> bool {
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self.type_().needs_lifetime()
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}
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}
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impl LifetimeExt for witx::Type {
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fn is_transparent(&self) -> bool {
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match self {
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witx::Type::Builtin(b) => b.is_transparent(),
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witx::Type::Record(s) => s.is_transparent(),
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witx::Type::Handle { .. } => true,
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witx::Type::Variant { .. }
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| witx::Type::Pointer { .. }
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| witx::Type::ConstPointer { .. }
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| witx::Type::List { .. } => false,
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}
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}
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fn needs_lifetime(&self) -> bool {
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match self {
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witx::Type::Builtin(b) => b.needs_lifetime(),
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witx::Type::Record(s) => s.needs_lifetime(),
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witx::Type::Variant(u) => u.needs_lifetime(),
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witx::Type::Handle { .. } => false,
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witx::Type::Pointer { .. }
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| witx::Type::ConstPointer { .. }
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| witx::Type::List { .. } => true,
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}
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}
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}
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impl LifetimeExt for witx::BuiltinType {
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fn is_transparent(&self) -> bool {
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true
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}
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fn needs_lifetime(&self) -> bool {
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false
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}
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}
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impl LifetimeExt for witx::RecordDatatype {
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fn is_transparent(&self) -> bool {
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self.members.iter().all(|m| m.tref.is_transparent())
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}
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fn needs_lifetime(&self) -> bool {
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self.members.iter().any(|m| m.tref.needs_lifetime())
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}
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}
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impl LifetimeExt for witx::Variant {
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fn is_transparent(&self) -> bool {
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false
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}
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fn needs_lifetime(&self) -> bool {
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self.cases
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.iter()
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.any(|m| m.tref.as_ref().map(|t| t.needs_lifetime()).unwrap_or(false))
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}
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}
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pub fn anon_lifetime() -> TokenStream {
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quote!('_)
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}
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