internal: Lazy eager macros

Author: Veykril

crates/hir-def/src/expander.rs

@@ -113,10 +113,10 @@ impl Expander {
         call_id: MacroCallId,
         error: Option<ExpandError>,
     ) -> ExpandResult<Option<InFile<Parse<SyntaxNode>>>> {
-        let file_id = call_id.as_file();
-        let ExpandResult { value, err } = db.parse_or_expand_with_err(file_id);
+        let macro_file = call_id.as_macro_file();
+        let ExpandResult { value, err } = db.parse_macro_expansion(macro_file);
 
-        ExpandResult { value: Some(InFile::new(file_id, value)), err: error.or(err) }
+        ExpandResult { value: Some(InFile::new(macro_file.into(), value.0)), err: error.or(err) }
     }
 
     pub fn exit(&mut self, db: &dyn DefDatabase, mut mark: Mark) {
@@ -179,8 +179,8 @@ impl Expander {
         } else if self.recursion_limit.check(self.recursion_depth as usize + 1).is_err() {
             self.recursion_depth = u32::MAX;
             cov_mark::hit!(your_stack_belongs_to_me);
-            return ExpandResult::only_err(ExpandError::Other(
-                "reached recursion limit during macro expansion".into(),
+            return ExpandResult::only_err(ExpandError::other(
+                "reached recursion limit during macro expansion",
             ));
         }
 

crates/hir-def/src/lib.rs

@@ -71,7 +71,7 @@ use hir_expand::{
     builtin_derive_macro::BuiltinDeriveExpander,
     builtin_fn_macro::{BuiltinFnLikeExpander, EagerExpander},
     db::ExpandDatabase,
-    eager::expand_eager_macro,
+    eager::expand_eager_macro_input,
     hygiene::Hygiene,
     proc_macro::ProcMacroExpander,
     AstId, ExpandError, ExpandResult, ExpandTo, HirFileId, InFile, MacroCallId, MacroCallKind,
@@ -865,7 +865,7 @@ impl AsMacroCall for InFile<&ast::MacroCall> {
         let path = self.value.path().and_then(|path| path::ModPath::from_src(db, path, &h));
 
         let Some(path) = path else {
-            return Ok(ExpandResult::only_err(ExpandError::Other("malformed macro invocation".into())));
+            return Ok(ExpandResult::only_err(ExpandError::other("malformed macro invocation")));
         };
 
         macro_call_as_call_id_(
@@ -913,7 +913,7 @@ fn macro_call_as_call_id_(
 
     let res = if let MacroDefKind::BuiltInEager(..) = def.kind {
         let macro_call = InFile::new(call.ast_id.file_id, call.ast_id.to_node(db));
-        expand_eager_macro(db, krate, macro_call, def, &resolver)?
+        expand_eager_macro_input(db, krate, macro_call, def, &resolver)?
     } else {
         ExpandResult {
             value: Some(def.as_lazy_macro(

crates/hir-def/src/macro_expansion_tests/builtin_fn_macro.rs

@@ -79,7 +79,7 @@ fn main() { env!("TEST_ENV_VAR"); }
 #[rustc_builtin_macro]
 macro_rules! env {() => {}}
 
-fn main() { "__RA_UNIMPLEMENTED__"; }
+fn main() { "UNRESOLVED_ENV_VAR"; }
 "##]],
     );
 }
@@ -442,10 +442,6 @@ macro_rules! surprise {
     () => { "s" };
 }
 
-macro_rules! stuff {
-    ($string:expr) => { concat!($string) };
-}
-
 fn main() { concat!(surprise!()); }
 "##,
         expect![[r##"
@@ -456,10 +452,6 @@ macro_rules! surprise {
     () => { "s" };
 }
 
-macro_rules! stuff {
-    ($string:expr) => { concat!($string) };
-}
-
 fn main() { "s"; }
 "##]],
     );

crates/hir-expand/src/builtin_derive_macro.rs

@@ -194,15 +194,15 @@ fn parse_adt(tt: &tt::Subtree) -> Result<BasicAdtInfo, ExpandError> {
     let (parsed, token_map) = mbe::token_tree_to_syntax_node(tt, mbe::TopEntryPoint::MacroItems);
     let macro_items = ast::MacroItems::cast(parsed.syntax_node()).ok_or_else(|| {
         debug!("derive node didn't parse");
-        ExpandError::Other("invalid item definition".into())
+        ExpandError::other("invalid item definition")
     })?;
     let item = macro_items.items().next().ok_or_else(|| {
         debug!("no module item parsed");
-        ExpandError::Other("no item found".into())
+        ExpandError::other("no item found")
     })?;
     let adt = ast::Adt::cast(item.syntax().clone()).ok_or_else(|| {
         debug!("expected adt, found: {:?}", item);
-        ExpandError::Other("expected struct, enum or union".into())
+        ExpandError::other("expected struct, enum or union")
     })?;
     let (name, generic_param_list, shape) = match &adt {
         ast::Adt::Struct(it) => (
@@ -305,7 +305,7 @@ fn parse_adt(tt: &tt::Subtree) -> Result<BasicAdtInfo, ExpandError> {
 fn name_to_token(token_map: &TokenMap, name: Option<ast::Name>) -> Result<tt::Ident, ExpandError> {
     let name = name.ok_or_else(|| {
         debug!("parsed item has no name");
-        ExpandError::Other("missing name".into())
+        ExpandError::other("missing name")
     })?;
     let name_token_id =
         token_map.token_by_range(name.syntax().text_range()).unwrap_or_else(TokenId::unspecified);