Auto merge of rust-lang#13602 - lowr:fix/nameres-transitive-visibilit…

…y, r=Veykril

fix: check visibility of each path segment

Upon path resolution, we have not been checking if every def pointed to by each segment of the path is visible from the original module. This leads to incorrect import resolutions, in particular when one uses glob imports and names collide.

There is decent amount of changes in this PR because:
- some of our tests were not correct in terms of visibility
  - I left several basic nameres tests as-is (with expect test updated) since I thought it would be nice to ensure we don't resolve defs that are not visible.
- `fix_visibility` assist relied on `Semantics::resolve_path()`, which uses the name resolution procedure I'm fixing and wouldn't be able to "see through" the items with strict visibility with this patch

The first commit is the gist of the fix itself.

Fixes rust-lang#10991
Fixes rust-lang#11473
Fixes rust-lang#13252

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

@@ -212,6 +212,7 @@ impl Import {
 
 #[derive(Debug, Eq, PartialEq)]
 struct ImportDirective {
+    /// The module this import directive is in.
     module_id: LocalModuleId,
     import: Import,
     status: PartialResolvedImport,
@@ -963,8 +964,10 @@ impl DefCollector<'_> {
 
     fn update(
         &mut self,
+        // The module for which `resolutions` have been resolve
         module_id: LocalModuleId,
         resolutions: &[(Option<Name>, PerNs)],
+        // Visibility this import will have
         vis: Visibility,
         import_type: ImportType,
     ) {
@@ -974,6 +977,7 @@ impl DefCollector<'_> {
 
     fn update_recursive(
         &mut self,
+        // The module for which `resolutions` have been resolve
         module_id: LocalModuleId,
         resolutions: &[(Option<Name>, PerNs)],
         // All resolutions are imported with this visibility; the visibilities in

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

@@ -73,7 +73,10 @@ impl DefMap {
     pub(crate) fn resolve_visibility(
         &self,
         db: &dyn DefDatabase,
+        // module to import to
         original_module: LocalModuleId,
+        // pub(path)
+        //     ^^^^ this
         visibility: &RawVisibility,
     ) -> Option<Visibility> {
         let mut vis = match visibility {
@@ -115,6 +118,7 @@ impl DefMap {
         &self,
         db: &dyn DefDatabase,
         mode: ResolveMode,
+        // module to import to
         mut original_module: LocalModuleId,
         path: &ModPath,
         shadow: BuiltinShadowMode,
@@ -361,6 +365,9 @@ impl DefMap {
                     );
                 }
             };
+
+            curr_per_ns = curr_per_ns
+                .filter_visibility(|vis| vis.is_visible_from_def_map(db, self, original_module));
         }
 
         ResolvePathResult::with(curr_per_ns, ReachedFixedPoint::Yes, None, Some(self.krate))

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

@@ -58,9 +58,9 @@ extern {
 "#,
         expect![[r#"
             crate
-            E: t
+            E: _
             S: t v
-            V: t v
+            V: _
             foo: t
 
             crate::foo
@@ -307,7 +307,7 @@ pub struct FromLib;
             Bar: t v
 
             crate::foo
-            Bar: t v
+            Bar: _
             FromLib: t v
         "#]],
     );

crates/hir-def/src/nameres/tests/globs.rs

@@ -119,7 +119,7 @@ use foo::*;
 use foo::bar::*;
 
 //- /foo/mod.rs
-mod bar;
+pub mod bar;
 fn Foo() {};
 pub struct Foo {};
 
@@ -132,6 +132,7 @@ pub(crate) struct PubCrateStruct;
             crate
             Foo: t
             PubCrateStruct: t v
+            bar: t
             foo: t
 
             crate::foo
@@ -336,3 +337,33 @@ mod d {
         "#]],
     );
 }
+
+#[test]
+fn glob_name_collision_check_visibility() {
+    check(
+        r#"
+mod event {
+    mod serenity {
+        pub fn Event() {}
+    }
+    use serenity::*;
+
+    pub struct Event {}
+}
+
+use event::Event;
+        "#,
+        expect![[r#"
+            crate
+            Event: t
+            event: t
+
+            crate::event
+            Event: t v
+            serenity: t
+
+            crate::event::serenity
+            Event: v
+        "#]],
+    );
+}

crates/hir-def/src/nameres/tests/mod_resolution.rs

@@ -580,7 +580,7 @@ fn module_resolution_decl_inside_inline_module_in_crate_root() {
 //- /main.rs
 mod foo {
     #[path = "baz.rs"]
-    mod bar;
+    pub mod bar;
 }
 use self::foo::bar::Baz;
 

crates/hir-ty/src/tests/method_resolution.rs

@@ -164,16 +164,16 @@ fn infer_associated_method_with_modules() {
     check_infer(
         r#"
         mod a {
-            struct A;
+            pub struct A;
             impl A { pub fn thing() -> A { A {} }}
         }
 
         mod b {
-            struct B;
+            pub struct B;
             impl B { pub fn thing() -> u32 { 99 }}
 
-            mod c {
-                struct C;
+            pub mod c {
+                pub struct C;
                 impl C { pub fn thing() -> C { C {} }}
             }
         }
@@ -186,22 +186,22 @@ fn infer_associated_method_with_modules() {
         }
         "#,
         expect![[r#"
-            55..63 '{ A {} }': A
-            57..61 'A {}': A
-            125..131 '{ 99 }': u32
-            127..129 '99': u32
-            201..209 '{ C {} }': C
-            203..207 'C {}': C
-            240..324 '{     ...g(); }': ()
-            250..251 'x': A
-            254..265 'a::A::thing': fn thing() -> A
-            254..267 'a::A::thing()': A
-            277..278 'y': u32
-            281..292 'b::B::thing': fn thing() -> u32
-            281..294 'b::B::thing()': u32
-            304..305 'z': C
-            308..319 'c::C::thing': fn thing() -> C
-            308..321 'c::C::thing()': C
+            59..67 '{ A {} }': A
+            61..65 'A {}': A
+            133..139 '{ 99 }': u32
+            135..137 '99': u32
+            217..225 '{ C {} }': C
+            219..223 'C {}': C
+            256..340 '{     ...g(); }': ()
+            266..267 'x': A
+            270..281 'a::A::thing': fn thing() -> A
+            270..283 'a::A::thing()': A
+            293..294 'y': u32
+            297..308 'b::B::thing': fn thing() -> u32
+            297..310 'b::B::thing()': u32
+            320..321 'z': C
+            324..335 'c::C::thing': fn thing() -> C
+            324..337 'c::C::thing()': C
         "#]],
     );
 }

crates/hir-ty/src/tests/simple.rs

@@ -214,7 +214,7 @@ fn infer_paths() {
 fn a() -> u32 { 1 }
 
 mod b {
-    fn c() -> u32 { 1 }
+    pub fn c() -> u32 { 1 }
 }
 
 fn test() {
@@ -225,13 +225,13 @@ fn test() {
         expect![[r#"
             14..19 '{ 1 }': u32
             16..17 '1': u32
-            47..52 '{ 1 }': u32
-            49..50 '1': u32
-            66..90 '{     ...c(); }': ()
-            72..73 'a': fn a() -> u32
-            72..75 'a()': u32
-            81..85 'b::c': fn c() -> u32
-            81..87 'b::c()': u32
+            51..56 '{ 1 }': u32
+            53..54 '1': u32
+            70..94 '{     ...c(); }': ()
+            76..77 'a': fn a() -> u32
+            76..79 'a()': u32
+            85..89 'b::c': fn c() -> u32
+            85..91 'b::c()': u32
         "#]],
     );
 }
@@ -1856,7 +1856,7 @@ fn not_shadowing_module_by_primitive() {
     check_types(
         r#"
 //- /str.rs
-fn foo() -> u32 {0}
+pub fn foo() -> u32 {0}
 
 //- /main.rs
 mod str;

crates/hir-ty/src/tests/traits.rs

@@ -1706,7 +1706,7 @@ fn where_clause_trait_in_scope_for_method_resolution() {
     check_types(
         r#"
 mod foo {
-    trait Trait {
+    pub trait Trait {
         fn foo(&self) -> u32 { 0 }
     }
 }
@@ -1723,7 +1723,7 @@ fn super_trait_method_resolution() {
     check_infer(
         r#"
 mod foo {
-    trait SuperTrait {
+    pub trait SuperTrait {
         fn foo(&self) -> u32 {}
     }
 }
@@ -1735,15 +1735,15 @@ fn test<T: Trait1, U: Trait2>(x: T, y: U) {
     y.foo();
 }"#,
         expect![[r#"
-            49..53 'self': &Self
-            62..64 '{}': u32
-            181..182 'x': T
-            187..188 'y': U
-            193..222 '{     ...o(); }': ()
-            199..200 'x': T
-            199..206 'x.foo()': u32
-            212..213 'y': U
-            212..219 'y.foo()': u32
+            53..57 'self': &Self
+            66..68 '{}': u32
+            185..186 'x': T
+            191..192 'y': U
+            197..226 '{     ...o(); }': ()
+            203..204 'x': T
+            203..210 'x.foo()': u32
+            216..217 'y': U
+            216..223 'y.foo()': u32
         "#]],
     );
 }
@@ -1754,7 +1754,7 @@ fn super_trait_impl_trait_method_resolution() {
         r#"
 //- minicore: sized
 mod foo {
-    trait SuperTrait {
+    pub trait SuperTrait {
         fn foo(&self) -> u32 {}
     }
 }
@@ -1764,12 +1764,12 @@ fn test(x: &impl Trait1) {
     x.foo();
 }"#,
         expect![[r#"
-            49..53 'self': &Self
-            62..64 '{}': u32
-            115..116 'x': &impl Trait1
-            132..148 '{     ...o(); }': ()
-            138..139 'x': &impl Trait1
-            138..145 'x.foo()': u32
+            53..57 'self': &Self
+            66..68 '{}': u32
+            119..120 'x': &impl Trait1
+            136..152 '{     ...o(); }': ()
+            142..143 'x': &impl Trait1
+            142..149 'x.foo()': u32
         "#]],
     );
 }