Add some size assertions

crates/hir-def/src/lib.rs

@@ -25,13 +25,13 @@ extern crate ra_ap_rustc_abi as rustc_abi;
 pub mod db;
 
 pub mod attr;
-pub mod path;
 pub mod builtin_type;
-pub mod per_ns;
 pub mod item_scope;
+pub mod path;
+pub mod per_ns;
 
-pub mod lower;
 pub mod expander;
+pub mod lower;
 
 pub mod dyn_map;
 
@@ -46,24 +46,24 @@ pub use self::hir::type_ref;
 pub mod body;
 pub mod resolver;
 
-mod trace;
 pub mod nameres;
+mod trace;
 
-pub mod src;
 pub mod child_by_source;
+pub mod src;
 
-pub mod visibility;
 pub mod find_path;
 pub mod import_map;
+pub mod visibility;
 
 pub use rustc_abi as layout;
 use triomphe::Arc;
 
-#[cfg(test)]
-mod test_db;
 #[cfg(test)]
 mod macro_expansion_tests;
 mod pretty;
+#[cfg(test)]
+mod test_db;
 
 use std::{
     hash::{Hash, Hasher},
@@ -73,7 +73,6 @@ use std::{
 use base_db::{impl_intern_key, salsa, CrateId, Edition};
 use hir_expand::{
     ast_id_map::{AstIdNode, FileAstId},
-    attrs::{Attr, AttrId, AttrInput},
     builtin_attr_macro::BuiltinAttrExpander,
     builtin_derive_macro::BuiltinDeriveExpander,
     builtin_fn_macro::{BuiltinFnLikeExpander, EagerExpander},
@@ -1274,60 +1273,6 @@ fn macro_call_as_call_id_with_eager(
     Ok(res)
 }
 
-fn derive_macro_as_call_id(
-    db: &dyn DefDatabase,
-    item_attr: &AstIdWithPath<ast::Adt>,
-    derive_attr_index: AttrId,
-    derive_pos: u32,
-    call_site: Span,
-    krate: CrateId,
-    resolver: impl Fn(path::ModPath) -> Option<(MacroId, MacroDefId)>,
-) -> Result<(MacroId, MacroDefId, MacroCallId), UnresolvedMacro> {
-    let (macro_id, def_id) = resolver(item_attr.path.clone())
-        .filter(|(_, def_id)| def_id.is_derive())
-        .ok_or_else(|| UnresolvedMacro { path: item_attr.path.clone() })?;
-    let call_id = def_id.as_lazy_macro(
-        db.upcast(),
-        krate,
-        MacroCallKind::Derive {
-            ast_id: item_attr.ast_id,
-            derive_index: derive_pos,
-            derive_attr_index,
-        },
-        call_site,
-    );
-    Ok((macro_id, def_id, call_id))
-}
-
-fn attr_macro_as_call_id(
-    db: &dyn DefDatabase,
-    item_attr: &AstIdWithPath<ast::Item>,
-    macro_attr: &Attr,
-    krate: CrateId,
-    def: MacroDefId,
-) -> MacroCallId {
-    let arg = match macro_attr.input.as_deref() {
-        Some(AttrInput::TokenTree(tt)) => {
-            let mut tt = tt.as_ref().clone();
-            tt.delimiter = tt::Delimiter::invisible_spanned(macro_attr.span);
-            Some(tt)
-        }
-
-        _ => None,
-    };
-
-    def.as_lazy_macro(
-        db.upcast(),
-        krate,
-        MacroCallKind::Attr {
-            ast_id: item_attr.ast_id,
-            attr_args: arg.map(Arc::new),
-            invoc_attr_index: macro_attr.id,
-        },
-        macro_attr.span,
-    )
-}
-
 #[derive(Debug)]
 pub struct UnresolvedMacro {
     pub path: hir_expand::mod_path::ModPath,

crates/hir-def/src/nameres/attr_resolution.rs

@@ -1,16 +1,21 @@
 //! Post-nameres attribute resolution.
 
-use hir_expand::{attrs::Attr, MacroCallId};
+use base_db::CrateId;
+use hir_expand::{
+    attrs::{Attr, AttrId, AttrInput},
+    MacroCallId, MacroCallKind, MacroDefId,
+};
+use span::Span;
 use syntax::{ast, SmolStr};
+use triomphe::Arc;
 
 use crate::{
     attr::builtin::{find_builtin_attr_idx, TOOL_MODULES},
-    attr_macro_as_call_id,
     db::DefDatabase,
     item_scope::BuiltinShadowMode,
     nameres::path_resolution::ResolveMode,
-    path::{ModPath, PathKind},
-    AstIdWithPath, LocalModuleId, UnresolvedMacro,
+    path::{self, ModPath, PathKind},
+    AstIdWithPath, LocalModuleId, MacroId, UnresolvedMacro,
 };
 
 use super::{DefMap, MacroSubNs};
@@ -93,3 +98,57 @@ impl DefMap {
         false
     }
 }
+
+pub(super) fn attr_macro_as_call_id(
+    db: &dyn DefDatabase,
+    item_attr: &AstIdWithPath<ast::Item>,
+    macro_attr: &Attr,
+    krate: CrateId,
+    def: MacroDefId,
+) -> MacroCallId {
+    let arg = match macro_attr.input.as_deref() {
+        Some(AttrInput::TokenTree(tt)) => {
+            let mut tt = tt.as_ref().clone();
+            tt.delimiter = tt::Delimiter::invisible_spanned(macro_attr.span);
+            Some(tt)
+        }
+
+        _ => None,
+    };
+
+    def.as_lazy_macro(
+        db.upcast(),
+        krate,
+        MacroCallKind::Attr {
+            ast_id: item_attr.ast_id,
+            attr_args: arg.map(Arc::new),
+            invoc_attr_index: macro_attr.id,
+        },
+        macro_attr.span,
+    )
+}
+
+pub(super) fn derive_macro_as_call_id(
+    db: &dyn DefDatabase,
+    item_attr: &AstIdWithPath<ast::Adt>,
+    derive_attr_index: AttrId,
+    derive_pos: u32,
+    call_site: Span,
+    krate: CrateId,
+    resolver: impl Fn(path::ModPath) -> Option<(MacroId, MacroDefId)>,
+) -> Result<(MacroId, MacroDefId, MacroCallId), UnresolvedMacro> {
+    let (macro_id, def_id) = resolver(item_attr.path.clone())
+        .filter(|(_, def_id)| def_id.is_derive())
+        .ok_or_else(|| UnresolvedMacro { path: item_attr.path.clone() })?;
+    let call_id = def_id.as_lazy_macro(
+        db.upcast(),
+        krate,
+        MacroCallKind::Derive {
+            ast_id: item_attr.ast_id,
+            derive_index: derive_pos,
+            derive_attr_index,
+        },
+        call_site,
+    );
+    Ok((macro_id, def_id, call_id))
+}

crates/hir-def/src/nameres/collector.rs

@@ -30,16 +30,15 @@ use triomphe::Arc;
 
 use crate::{
     attr::Attrs,
-    attr_macro_as_call_id,
     db::DefDatabase,
-    derive_macro_as_call_id,
     item_scope::{ImportId, ImportOrExternCrate, ImportType, PerNsGlobImports},
     item_tree::{
         self, ExternCrate, Fields, FileItemTreeId, ImportKind, ItemTree, ItemTreeId,
         ItemTreeModItemNode, Macro2, MacroCall, MacroRules, Mod, ModItem, ModKind, TreeId,
     },
     macro_call_as_call_id, macro_call_as_call_id_with_eager,
     nameres::{
+        attr_resolution::{attr_macro_as_call_id, derive_macro_as_call_id},
         diagnostics::DefDiagnostic,
         mod_resolution::ModDir,
         path_resolution::ReachedFixedPoint,
@@ -1245,7 +1244,9 @@ impl DefCollector<'_> {
                         MacroDefId { kind: MacroDefKind::BuiltInAttr(expander, _),.. }
                         if expander.is_derive()
                     ) {
-                        // Resolved to `#[derive]`
+                        // Resolved to `#[derive]`, we don't actually expand this attribute like
+                        // normal (as that would just be an identity expansion with extra output)
+                        // Instead we treat derive attributes special and apply them separately.
 
                         let item_tree = tree.item_tree(self.db);
                         let ast_adt_id: FileAstId<ast::Adt> = match *mod_item {
@@ -1284,7 +1285,8 @@ impl DefCollector<'_> {
                                 }
 
                                 // We treat the #[derive] macro as an attribute call, but we do not resolve it for nameres collection.
-                                // This is just a trick to be able to resolve the input to derives as proper paths.
+                                // This is just a trick to be able to resolve the input to derives
+                                // as proper paths in `Semantics`.
                                 // Check the comment in [`builtin_attr_macro`].
                                 let call_id = attr_macro_as_call_id(
                                     self.db,

crates/hir-def/src/visibility.rs

@@ -4,6 +4,7 @@ use std::iter;
 
 use hir_expand::{span_map::SpanMapRef, InFile};
 use la_arena::ArenaMap;
+use stdx::assert_eq_size;
 use syntax::ast;
 use triomphe::Arc;
 
@@ -24,6 +25,7 @@ pub enum RawVisibility {
     /// `pub`.
     Public,
 }
+assert_eq_size!(RawVisibility, 48);
 
 impl RawVisibility {
     pub(crate) const fn private() -> RawVisibility {

crates/hir-expand/src/builtin_attr_macro.rs

@@ -48,11 +48,13 @@ impl BuiltinAttrExpander {
 
 register_builtin! { expand:
     (bench, Bench) => dummy_attr_expand,
+    (cfg, Cfg) => dummy_attr_expand,
+    (cfg_attr, CfgAttr) => dummy_attr_expand,
     (cfg_accessible, CfgAccessible) => dummy_attr_expand,
     (cfg_eval, CfgEval) => dummy_attr_expand,
-    (derive, Derive) => derive_attr_expand,
+    (derive, Derive) => derive_expand,
     // derive const is equivalent to derive for our proposes.
-    (derive_const, DeriveConst) => derive_attr_expand,
+    (derive_const, DeriveConst) => derive_expand,
     (global_allocator, GlobalAllocator) => dummy_attr_expand,
     (test, Test) => dummy_attr_expand,
     (test_case, TestCase) => dummy_attr_expand
@@ -91,7 +93,7 @@ fn dummy_attr_expand(
 /// always resolve as a derive without nameres recollecting them.
 /// So this hacky approach is a lot more friendly for us, though it does require a bit of support in
 /// [`hir::Semantics`] to make this work.
-fn derive_attr_expand(
+fn derive_expand(
     db: &dyn ExpandDatabase,
     id: MacroCallId,
     tt: &tt::Subtree,

crates/hir-expand/src/lib.rs

@@ -26,6 +26,7 @@ pub mod span_map;
 mod fixup;
 
 use attrs::collect_attrs;
+use stdx::assert_eq_size;
 use triomphe::Arc;
 
 use std::{fmt, hash::Hash};
@@ -175,6 +176,7 @@ pub struct MacroCallLoc {
     pub kind: MacroCallKind,
     pub call_site: Span,
 }
+assert_eq_size!(MacroCallLoc, 104);
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct MacroDefId {
@@ -185,6 +187,7 @@ pub struct MacroDefId {
     pub allow_internal_unsafe: bool,
     pub span: Span,
 }
+assert_eq_size!(MacroDefId, 44);
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum MacroDefKind {

crates/hir-expand/src/mod_path.rs

@@ -15,13 +15,15 @@ use crate::{
 use base_db::CrateId;
 use smallvec::SmallVec;
 use span::SyntaxContextId;
+use stdx::assert_eq_size;
 use syntax::{ast, AstNode};
 
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct ModPath {
     pub kind: PathKind,
     segments: SmallVec<[Name; 1]>,
 }
+assert_eq_size!(ModPath, 40);
 
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct UnescapedModPath<'a>(&'a ModPath);

crates/hir-expand/src/name.rs

@@ -2,6 +2,7 @@
 
 use std::fmt;
 
+use stdx::assert_eq_size;
 use syntax::{ast, format_smolstr, utils::is_raw_identifier, SmolStr};
 
 /// `Name` is a wrapper around string, which is used in hir for both references
@@ -13,6 +14,7 @@ use syntax::{ast, format_smolstr, utils::is_raw_identifier, SmolStr};
 /// name without "r#".
 #[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub struct Name(Repr);
+assert_eq_size!(Name, 24);
 
 /// Wrapper of `Name` to print the name without "r#" even when it is a raw identifier.
 #[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]