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remove salsa::requires feature

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This commit is contained in:
Niko Matsakis 2020-07-01 10:28:57 +00:00
parent 6e813441cb
commit b3ffaec3b0
3 changed files with 16 additions and 103 deletions
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8
components/salsa-macros/src/lib.rs
View file

@ -46,14 +46,6 @@ mod query_group;
///
/// Here is a list of legal `salsa::XXX` attributes:
///
/// - Query group attributes: apply to the trait itself
/// - `#[salsa::requires(OtherGroup)]` -- makes `OtherGroup` a
/// private dependency of the current group. That means that
/// functions that implement queries have `: OutherGropup` bound
/// on the database argument. This is similar to just making `OtherGroup`
/// a super trait, with a difference that users of the query group don't
/// get access to `OtherGroup` automatically, which would be the case with
/// a super trait.
/// - Storage attributes: control how the query data is stored and set. These
/// are described in detail in the section below.
/// - `#[salsa::input]`

42
components/salsa-macros/src/query_group.rs
View file

@ -5,10 +5,8 @@ use heck::CamelCase;
use proc_macro::TokenStream;
use proc_macro2::Span;
use quote::ToTokens;
use syn::punctuated::Punctuated;
use syn::{
parse_macro_input, parse_quote, Attribute, FnArg, Ident, ItemTrait, Path, ReturnType, Token,
TraitBound, TraitBoundModifier, TraitItem, Type, TypeParamBound,
parse_macro_input, parse_quote, Attribute, FnArg, Ident, ItemTrait, ReturnType, TraitItem, Type,
};
/// Implementation for `[salsa::query_group]` decorator.
@ -19,14 +17,8 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
// println!("input: {:#?}", input);
let (trait_attrs, salsa_attrs) = filter_attrs(input.attrs);
let mut requires: Punctuated<Path, Token![+]> = Punctuated::new();
for SalsaAttr { name, tts } in salsa_attrs {
match name.as_str() {
"requires" => {
requires.push(parse_macro_input!(tts as Parenthesized<syn::Path>).0);
}
_ => panic!("unknown salsa attribute `{}`", name),
}
if !salsa_attrs.is_empty() {
panic!("unsupported attributes: {:?}", salsa_attrs);
}
let trait_vis = input.vis;
@ -303,7 +295,7 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
impl<DB__> salsa::plumbing::QueryGroup<DB__> for #group_struct
where
DB__: #trait_name + #requires,
DB__: #trait_name,
DB__: salsa::plumbing::HasQueryGroup<#group_struct>,
DB__: salsa::Database,
{
@ -313,15 +305,7 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
// Emit an impl of the trait
output.extend({
let mut bounds = input.supertraits.clone();
for path in requires.clone() {
bounds.push(TypeParamBound::Trait(TraitBound {
paren_token: None,
modifier: TraitBoundModifier::None,
lifetimes: None,
path,
}));
}
let bounds = input.supertraits.clone();
quote! {
impl<T> #trait_name for T
where
@ -370,7 +354,7 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
// of the `GroupData`.
impl<#db> salsa::Query<#db> for #qt
where
DB: #trait_name + #requires,
DB: #trait_name,
DB: salsa::plumbing::HasQueryGroup<#group_struct>,
DB: salsa::Database,
{
@ -423,7 +407,7 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
output.extend(quote_spanned! {span=>
impl<DB> salsa::plumbing::QueryFunction<DB> for #qt
where
DB: #trait_name + #requires,
DB: #trait_name,
DB: salsa::plumbing::HasQueryGroup<#group_struct>,
DB: salsa::Database,
{
@ -471,7 +455,7 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
output.extend(quote! {
#trait_vis struct #group_storage<DB__>
where
DB__: #trait_name + #requires,
DB__: #trait_name,
DB__: salsa::plumbing::HasQueryGroup<#group_struct>,
DB__: salsa::Database,
{
@ -480,7 +464,7 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
impl<DB__> #group_storage<DB__>
where
DB__: #trait_name + #requires,
DB__: #trait_name,
DB__: salsa::plumbing::HasQueryGroup<#group_struct>,
DB__: salsa::Database,
{
@ -496,7 +480,7 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
impl<DB__> #group_storage<DB__>
where
DB__: #trait_name + #requires,
DB__: #trait_name,
DB__: salsa::plumbing::HasQueryGroup<#group_struct>,
{
#trait_vis fn fmt_index(
@ -547,6 +531,12 @@ struct SalsaAttr {
tts: TokenStream,
}
impl std::fmt::Debug for SalsaAttr {
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(fmt, "{:?}", self.name)
}
}
impl TryFrom<syn::Attribute> for SalsaAttr {
type Error = syn::Attribute;
fn try_from(attr: syn::Attribute) -> Result<SalsaAttr, syn::Attribute> {