From cdb0e25aaa8407caca878cfd0e92d46bb50b6da1 Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Thu, 21 Jan 2021 18:05:52 +0100
Subject: Make use of `block_def_map` in body lowering

Removes the `local_scope` hack from `Expander` in favor of tracking the
`DefMap` in use during body lowering
---
 crates/hir_def/src/body.rs       | 19 ++++++-------------
 crates/hir_def/src/body/lower.rs | 16 ++++++++++++----
 crates/hir_def/src/data.rs       |  2 +-
 3 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/crates/hir_def/src/body.rs b/crates/hir_def/src/body.rs
index 2c2c999dd..8e8c0271f 100644
--- a/crates/hir_def/src/body.rs
+++ b/crates/hir_def/src/body.rs
@@ -45,7 +45,7 @@ pub(crate) struct CfgExpander {
 
 pub(crate) struct Expander {
     cfg_expander: CfgExpander,
-    crate_def_map: Arc<DefMap>,
+    def_map: Arc<DefMap>,
     current_file_id: HirFileId,
     ast_id_map: Arc<AstIdMap>,
     module: ModuleId,
@@ -90,7 +90,7 @@ impl Expander {
         let ast_id_map = db.ast_id_map(current_file_id);
         Expander {
             cfg_expander,
-            crate_def_map,
+            def_map: crate_def_map,
             current_file_id,
             ast_id_map,
             module,
@@ -101,7 +101,6 @@ impl Expander {
     pub(crate) fn enter_expand<T: ast::AstNode>(
         &mut self,
         db: &dyn DefDatabase,
-        local_scope: Option<&ItemScope>,
         macro_call: ast::MacroCall,
     ) -> ExpandResult<Option<(Mark, T)>> {
         if self.recursion_limit + 1 > EXPANSION_RECURSION_LIMIT {
@@ -111,18 +110,12 @@ impl Expander {
 
         let macro_call = InFile::new(self.current_file_id, &macro_call);
 
-        let resolver = |path: ModPath| -> Option<MacroDefId> {
-            if let Some(local_scope) = local_scope {
-                if let Some(def) = path.as_ident().and_then(|n| local_scope.get_legacy_macro(n)) {
-                    return Some(def);
-                }
-            }
-            self.resolve_path_as_macro(db, &path)
-        };
+        let resolver =
+            |path: ModPath| -> Option<MacroDefId> { self.resolve_path_as_macro(db, &path) };
 
         let mut err = None;
         let call_id =
-            macro_call.as_call_id_with_errors(db, self.crate_def_map.krate(), resolver, &mut |e| {
+            macro_call.as_call_id_with_errors(db, self.def_map.krate(), resolver, &mut |e| {
                 err.get_or_insert(e);
             });
         let call_id = match call_id {
@@ -203,7 +196,7 @@ impl Expander {
     }
 
     fn resolve_path_as_macro(&self, db: &dyn DefDatabase, path: &ModPath) -> Option<MacroDefId> {
-        self.crate_def_map
+        self.def_map
             .resolve_path(db, self.module.local_id, path, BuiltinShadowMode::Other)
             .0
             .take_macros()
diff --git a/crates/hir_def/src/body/lower.rs b/crates/hir_def/src/body/lower.rs
index 4ce5e5b72..2c8a86723 100644
--- a/crates/hir_def/src/body/lower.rs
+++ b/crates/hir_def/src/body/lower.rs
@@ -1,7 +1,7 @@
 //! Transforms `ast::Expr` into an equivalent `hir_def::expr::Expr`
 //! representation.
 
-use std::{any::type_name, sync::Arc};
+use std::{any::type_name, mem, sync::Arc};
 
 use either::Either;
 use hir_expand::{
@@ -559,7 +559,7 @@ impl ExprCollector<'_> {
         let outer_file = self.expander.current_file_id;
 
         let macro_call = self.expander.to_source(AstPtr::new(&e));
-        let res = self.expander.enter_expand(self.db, Some(&self.body.item_scope), e);
+        let res = self.expander.enter_expand(self.db, e);
 
         match &res.err {
             Some(ExpandError::UnresolvedProcMacro) => {
@@ -696,11 +696,19 @@ impl ExprCollector<'_> {
 
     fn collect_block(&mut self, block: ast::BlockExpr) -> ExprId {
         let syntax_node_ptr = AstPtr::new(&block.clone().into());
+        let ast_id = self.expander.ast_id(&block);
+        let def_map = self.db.block_def_map(self.expander.module.krate, ast_id);
+        let prev_def_map = mem::replace(&mut self.expander.def_map, def_map);
+
         self.collect_stmts_items(block.statements());
         let statements =
             block.statements().filter_map(|s| self.collect_stmt(s)).flatten().collect();
         let tail = block.tail_expr().map(|e| self.collect_expr(e));
-        self.alloc_expr(Expr::Block { statements, tail, label: None }, syntax_node_ptr)
+        let expr_id =
+            self.alloc_expr(Expr::Block { statements, tail, label: None }, syntax_node_ptr);
+
+        self.expander.def_map = prev_def_map;
+        expr_id
     }
 
     fn collect_stmts_items(&mut self, stmts: ast::AstChildren<ast::Stmt>) {
@@ -830,7 +838,7 @@ impl ExprCollector<'_> {
                 if annotation == BindingAnnotation::Unannotated && subpat.is_none() {
                     // This could also be a single-segment path pattern. To
                     // decide that, we need to try resolving the name.
-                    let (resolved, _) = self.expander.crate_def_map.resolve_path(
+                    let (resolved, _) = self.expander.def_map.resolve_path(
                         self.db,
                         self.expander.module.local_id,
                         &name.clone().into(),
diff --git a/crates/hir_def/src/data.rs b/crates/hir_def/src/data.rs
index e7b7724f7..c2b0dc007 100644
--- a/crates/hir_def/src/data.rs
+++ b/crates/hir_def/src/data.rs
@@ -262,7 +262,7 @@ fn collect_items(
                 let root = db.parse_or_expand(file_id).unwrap();
                 let call = ast_id_map.get(call.ast_id).to_node(&root);
 
-                if let Some((mark, mac)) = expander.enter_expand(db, None, call).value {
+                if let Some((mark, mac)) = expander.enter_expand(db, call).value {
                     let src: InFile<ast::MacroItems> = expander.to_source(mac);
                     let item_tree = db.item_tree(src.file_id);
                     let iter =
-- 
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