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Improve proc macro errors a bit

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Distinguish between
 - there is no build data (for some reason?)
 - there is build data, but the cargo package didn't build a proc macro dylib
 - there is a proc macro dylib, but it didn't contain the proc macro we expected
 - the name did not resolve to any macro (this is now an
 unresolved_macro_call even for attributes)

I changed the handling of disabled attribute macro expansion to
immediately ignore the macro and report an unresolved_proc_macro,
because otherwise they would now result in loud unresolved_macro_call
errors. I hope this doesn't break anything.

Also try to improve error ranges for unresolved_macro_call / macro_error
by reusing the code for unresolved_proc_macro. It's not perfect but
probably better than before.
This commit is contained in:
Florian Diebold 2022-06-24 13:03:13 +02:00
parent 32b40ded0f
commit c80c34867f
10 changed files with 164 additions and 163 deletions
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17
crates/hir-expand/src/proc_macro.rs
View file

@ -1,6 +1,7 @@
//! Proc Macro Expander stub
use base_db::{CrateId, ProcMacroExpansionError, ProcMacroId, ProcMacroKind};
use stdx::never;
use crate::{db::AstDatabase, ExpandError, ExpandResult};
@ -36,18 +37,20 @@ impl ProcMacroExpander {
let krate_graph = db.crate_graph();
let proc_macros = match &krate_graph[self.krate].proc_macro {
Ok(proc_macros) => proc_macros,
Err(e) => {
return ExpandResult::only_err(ExpandError::Other(
e.clone().into_boxed_str(),
))
Err(_) => {
never!("Non-dummy expander even though there are no proc macros");
return ExpandResult::only_err(ExpandError::Other("Internal error".into()));
}
};
let proc_macro = match proc_macros.get(id.0 as usize) {
Some(proc_macro) => proc_macro,
None => {
return ExpandResult::only_err(ExpandError::Other(
"No proc-macro found.".into(),
))
never!(
"Proc macro index out of bounds: the length is {} but the index is {}",
proc_macros.len(),
id.0
);
return ExpandResult::only_err(ExpandError::Other("Internal error".into()));
}
};