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do not generate in_db_mut when it is inappropriate

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This commit is contained in:
Niko Matsakis 2020-07-06 21:48:14 +00:00
parent d2e9f64bda
commit fd036a4f15
1 changed files with 20 additions and 0 deletions
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20
components/salsa-macros/src/query_group.rs
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@ -364,7 +364,9 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
output.extend(quote! {
#[derive(Default, Debug)]
#trait_vis struct #qt;
});
output.extend(quote! {
impl #qt {
/// Get access to extra methods pertaining to this query. For
/// example, you can use this to run the GC (`sweep`) across a
@ -375,7 +377,12 @@ pub(crate) fn query_group(args: TokenStream, input: TokenStream) -> TokenStream
{
salsa::plumbing::get_query_table::<#qt>(db)
}
}
});
if query.storage.supports_mut() {}
output.extend(quote! {
impl #qt {
/// Like `in_db`, but gives access to methods for setting the
/// value of an input. Not applicable to derived queries.
///
@ -651,6 +658,7 @@ enum QueryStorage {
}
impl QueryStorage {
/// Do we need a `QueryFunction` impl for this type of query?
fn needs_query_function(&self) -> bool {
match self {
QueryStorage::Input
@ -660,4 +668,16 @@ impl QueryStorage {
QueryStorage::Memoized | QueryStorage::Dependencies => true,
}
}
/// Does this type of query support `&mut` operations?
fn supports_mut(&self) -> bool {
match self {
QueryStorage::Input => true,
QueryStorage::Interned
| QueryStorage::InternedLookup { .. }
| QueryStorage::Transparent
| QueryStorage::Memoized
| QueryStorage::Dependencies => false,
}
}
}