From 29f93a79069cf929fbc6d4efa194a0ab18bb1f45 Mon Sep 17 00:00:00 2001
From: Ville Penttinen <villem.penttinen@gmail.com>
Date: Mon, 25 Feb 2019 10:21:01 +0200
Subject: Add static type inference

---
 crates/ra_hir/src/ty/infer.rs                       |  3 ++-
 crates/ra_hir/src/ty/lower.rs                       | 21 +++++++++++++++++----
 .../src/ty/snapshots/tests__infer_static.snap       | 10 +++++-----
 3 files changed, 24 insertions(+), 10 deletions(-)

(limited to 'crates/ra_hir/src/ty')

diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index f5f85308c..5e4d49ffb 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -485,7 +485,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             TypableDef::TypeAlias(_)
             | TypableDef::Function(_)
             | TypableDef::Enum(_)
-            | TypableDef::Const(_) => (Ty::Unknown, None),
+            | TypableDef::Const(_)
+            | TypableDef::Static(_) => (Ty::Unknown, None),
         }
     }
 
diff --git a/crates/ra_hir/src/ty/lower.rs b/crates/ra_hir/src/ty/lower.rs
index 4a9b725d1..f4e055feb 100644
--- a/crates/ra_hir/src/ty/lower.rs
+++ b/crates/ra_hir/src/ty/lower.rs
@@ -11,7 +11,7 @@ use std::sync::Arc;
 use crate::{
     Function, Struct, StructField, Enum, EnumVariant, Path, Name,
     ModuleDef, TypeAlias,
-    Const,
+    Const, Static,
     HirDatabase,
     type_ref::TypeRef,
     name::KnownName,
@@ -126,7 +126,7 @@ impl Ty {
             TypableDef::Enum(e) => e.generic_params(db),
             TypableDef::EnumVariant(var) => var.parent_enum(db).generic_params(db),
             TypableDef::TypeAlias(t) => t.generic_params(db),
-            TypableDef::Const(_) => GenericParams::default().into(),
+            TypableDef::Const(_) | TypableDef::Static(_) => GenericParams::default().into(),
         };
         let parent_param_count = def_generics.count_parent_params();
         substs.extend((0..parent_param_count).map(|_| Ty::Unknown));
@@ -166,6 +166,7 @@ impl Ty {
             | TypableDef::Struct(_)
             | TypableDef::Enum(_)
             | TypableDef::Const(_)
+            | TypableDef::Static(_)
             | TypableDef::TypeAlias(_) => last,
             TypableDef::EnumVariant(_) => {
                 // the generic args for an enum variant may be either specified
@@ -201,6 +202,7 @@ pub(crate) fn type_for_def(db: &impl HirDatabase, def: TypableDef, ns: Namespace
         (TypableDef::EnumVariant(v), Namespace::Values) => type_for_enum_variant_constructor(db, v),
         (TypableDef::TypeAlias(t), Namespace::Types) => type_for_type_alias(db, t),
         (TypableDef::Const(c), Namespace::Values) => type_for_const(db, c),
+        (TypableDef::Static(c), Namespace::Values) => type_for_static(db, c),
 
         // 'error' cases:
         (TypableDef::Function(_), Namespace::Types) => Ty::Unknown,
@@ -208,6 +210,7 @@ pub(crate) fn type_for_def(db: &impl HirDatabase, def: TypableDef, ns: Namespace
         (TypableDef::EnumVariant(_), Namespace::Types) => Ty::Unknown,
         (TypableDef::TypeAlias(_), Namespace::Values) => Ty::Unknown,
         (TypableDef::Const(_), Namespace::Types) => Ty::Unknown,
+        (TypableDef::Static(_), Namespace::Types) => Ty::Unknown,
     }
 }
 
@@ -246,6 +249,14 @@ fn type_for_const(db: &impl HirDatabase, def: Const) -> Ty {
     Ty::from_hir(db, &resolver, signature.type_ref())
 }
 
+/// Build the declared type of a static.
+fn type_for_static(db: &impl HirDatabase, def: Static) -> Ty {
+    let signature = def.signature(db);
+    let resolver = def.resolver(db);
+
+    Ty::from_hir(db, &resolver, signature.type_ref())
+}
+
 /// Build the type of a tuple struct constructor.
 fn type_for_struct_constructor(db: &impl HirDatabase, def: Struct) -> Ty {
     let var_data = def.variant_data(db);
@@ -332,8 +343,9 @@ pub enum TypableDef {
     EnumVariant(EnumVariant),
     TypeAlias(TypeAlias),
     Const(Const),
+    Static(Static),
 }
-impl_froms!(TypableDef: Function, Struct, Enum, EnumVariant, TypeAlias, Const);
+impl_froms!(TypableDef: Function, Struct, Enum, EnumVariant, TypeAlias, Const, Static);
 
 impl From<ModuleDef> for Option<TypableDef> {
     fn from(def: ModuleDef) -> Option<TypableDef> {
@@ -344,7 +356,8 @@ impl From<ModuleDef> for Option<TypableDef> {
             ModuleDef::EnumVariant(v) => v.into(),
             ModuleDef::TypeAlias(t) => t.into(),
             ModuleDef::Const(v) => v.into(),
-            ModuleDef::Static(_) | ModuleDef::Module(_) | ModuleDef::Trait(_) => return None,
+            ModuleDef::Static(v) => v.into(),
+            ModuleDef::Module(_) | ModuleDef::Trait(_) => return None,
         };
         Some(res)
     }
diff --git a/crates/ra_hir/src/ty/snapshots/tests__infer_static.snap b/crates/ra_hir/src/ty/snapshots/tests__infer_static.snap
index ffe9ca66d..5d90f56ed 100644
--- a/crates/ra_hir/src/ty/snapshots/tests__infer_static.snap
+++ b/crates/ra_hir/src/ty/snapshots/tests__infer_static.snap
@@ -1,5 +1,5 @@
 ---
-created: "2019-02-25T07:26:41.480764900Z"
+created: "2019-02-25T08:20:17.807316Z"
 creator: insta@0.6.3
 source: crates/ra_hir/src/ty/tests.rs
 expression: "&result"
@@ -9,8 +9,8 @@ expression: "&result"
 [177; 189) 'LOCAL_STATIC': [unknown]
 [199; 200) 'y': [unknown]
 [203; 219) 'LOCAL_...IC_MUT': [unknown]
-[229; 230) 'z': [unknown]
-[233; 246) 'GLOBAL_STATIC': [unknown]
-[256; 257) 'w': [unknown]
-[260; 277) 'GLOBAL...IC_MUT': [unknown]
+[229; 230) 'z': u32
+[233; 246) 'GLOBAL_STATIC': u32
+[256; 257) 'w': u32
+[260; 277) 'GLOBAL...IC_MUT': u32
 
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