Merge #1015

1015: Change primitive integers to have signedness and bitness r=matklad a=yanchith

Fixes #1004 

This creates enums: `Signedness`, `IntBitness` and `FloatBitness`, and condenses `UintTy` with `IntTy`, making use of the created enums. `FloatTy` is also changed from an enum into a struct containing `FloatBitness`.

`UncertainIntTy` and `UncertainFloatTy` now look much more similar.

`Ord` was removed from the types because `{u,i}size` aren't easily orderable with the rest. Fortunately this wasn't depended on anywhere.

Co-authored-by: yanchith <[email protected]>

4 files changed, 155 insertions, 144 deletions

diff --git a/crates/ra_hir/src/expr.rs b/crates/ra_hir/src/expr.rs
index 486314cc5..0fadab560 100644
--- a/crates/ra_hir/src/expr.rs
+++ b/crates/ra_hir/src/expr.rs
@@ -14,7 +14,7 @@ use crate::{
     name::AsName,
     type_ref::{Mutability, TypeRef},
 };
-use crate::{ path::GenericArgs, ty::primitive::{UintTy, UncertainIntTy, UncertainFloatTy}};
+use crate::{ path::GenericArgs, ty::primitive::{IntTy, UncertainIntTy, FloatTy, UncertainFloatTy}};
 
 pub use self::scope::{ExprScopes, ScopesWithSourceMap, ScopeEntryWithSyntax};
 
@@ -723,7 +723,8 @@ impl ExprCollector {
 
                 let lit = match child.flavor() {
                     LiteralFlavor::IntNumber { suffix } => {
-                        let known_name = suffix.and_then(|it| UncertainIntTy::from_suffix(&it));
+                        let known_name = suffix
+                            .and_then(|it| IntTy::from_suffix(&it).map(UncertainIntTy::Known));
 
                         Literal::Int(
                             Default::default(),
@@ -731,7 +732,8 @@ impl ExprCollector {
                         )
                     }
                     LiteralFlavor::FloatNumber { suffix } => {
-                        let known_name = suffix.and_then(|it| UncertainFloatTy::from_suffix(&it));
+                        let known_name = suffix
+                            .and_then(|it| FloatTy::from_suffix(&it).map(UncertainFloatTy::Known));
 
                         Literal::Float(
                             Default::default(),
@@ -741,7 +743,7 @@ impl ExprCollector {
                     LiteralFlavor::ByteString => Literal::ByteString(Default::default()),
                     LiteralFlavor::String => Literal::String(Default::default()),
                     LiteralFlavor::Byte => {
-                        Literal::Int(Default::default(), UncertainIntTy::Unsigned(UintTy::U8))
+                        Literal::Int(Default::default(), UncertainIntTy::Known(IntTy::u8()))
                     }
                     LiteralFlavor::Bool => Literal::Bool(Default::default()),
                     LiteralFlavor::Char => Literal::Char(Default::default()),
diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index bf42befbb..7cf465266 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -990,7 +990,12 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                         match &inner_ty {
                             Ty::Apply(a_ty) => match a_ty.ctor {
                                 TypeCtor::Int(primitive::UncertainIntTy::Unknown)
-                                | TypeCtor::Int(primitive::UncertainIntTy::Signed(..))
+                                | TypeCtor::Int(primitive::UncertainIntTy::Known(
+                                    primitive::IntTy {
+                                        signedness: primitive::Signedness::Signed,
+                                        ..
+                                    },
+                                ))
                                 | TypeCtor::Float(..) => inner_ty,
                                 _ => Ty::Unknown,
                             },
@@ -1064,8 +1069,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                     Ty::apply_one(TypeCtor::Ref(Mutability::Shared), Ty::simple(TypeCtor::Str))
                 }
                 Literal::ByteString(..) => {
-                    let byte_type = Ty::simple(TypeCtor::Int(primitive::UncertainIntTy::Unsigned(
-                        primitive::UintTy::U8,
+                    let byte_type = Ty::simple(TypeCtor::Int(primitive::UncertainIntTy::Known(
+                        primitive::IntTy::u8(),
                     )));
                     let slice_type = Ty::apply_one(TypeCtor::Slice, byte_type);
                     Ty::apply_one(TypeCtor::Ref(Mutability::Shared), slice_type)
@@ -1208,10 +1213,10 @@ impl InferTy {
         match self {
             InferTy::TypeVar(..) => Ty::Unknown,
             InferTy::IntVar(..) => {
-                Ty::simple(TypeCtor::Int(primitive::UncertainIntTy::Signed(primitive::IntTy::I32)))
+                Ty::simple(TypeCtor::Int(primitive::UncertainIntTy::Known(primitive::IntTy::i32())))
             }
             InferTy::FloatVar(..) => Ty::simple(TypeCtor::Float(
-                primitive::UncertainFloatTy::Known(primitive::FloatTy::F64),
+                primitive::UncertainFloatTy::Known(primitive::FloatTy::f64()),
             )),
         }
     }
diff --git a/crates/ra_hir/src/ty/lower.rs b/crates/ra_hir/src/ty/lower.rs
index 72b1234bf..7f9af307b 100644
--- a/crates/ra_hir/src/ty/lower.rs
+++ b/crates/ra_hir/src/ty/lower.rs
@@ -61,10 +61,10 @@ impl Ty {
     pub(crate) fn from_hir_path(db: &impl HirDatabase, resolver: &Resolver, path: &Path) -> Self {
         if let Some(name) = path.as_ident() {
             // TODO handle primitive type names in resolver as well?
-            if let Some(int_ty) = primitive::UncertainIntTy::from_type_name(name) {
-                return Ty::simple(TypeCtor::Int(int_ty));
-            } else if let Some(float_ty) = primitive::UncertainFloatTy::from_type_name(name) {
-                return Ty::simple(TypeCtor::Float(float_ty));
+            if let Some(int_ty) = primitive::IntTy::from_type_name(name) {
+                return Ty::simple(TypeCtor::Int(primitive::UncertainIntTy::Known(int_ty)));
+            } else if let Some(float_ty) = primitive::FloatTy::from_type_name(name) {
+                return Ty::simple(TypeCtor::Float(primitive::UncertainFloatTy::Known(float_ty)));
             } else if let Some(known) = name.as_known_name() {
                 match known {
                     KnownName::Bool => return Ty::simple(TypeCtor::Bool),
diff --git a/crates/ra_hir/src/ty/primitive.rs b/crates/ra_hir/src/ty/primitive.rs
index 421f7e980..b37326db7 100644
--- a/crates/ra_hir/src/ty/primitive.rs
+++ b/crates/ra_hir/src/ty/primitive.rs
@@ -2,61 +2,49 @@ use std::fmt;
 
 use crate::{Name, KnownName};
 
-#[derive(Debug, Clone, Eq, PartialEq, Hash, Copy)]
-pub enum UncertainIntTy {
-    Unknown,
-    Unsigned(UintTy),
-    Signed(IntTy),
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum Signedness {
+    Signed,
+    Unsigned,
 }
 
-impl UncertainIntTy {
-    pub(crate) fn from_type_name(name: &Name) -> Option<UncertainIntTy> {
-        if let Some(ty) = IntTy::from_type_name(name) {
-            Some(UncertainIntTy::Signed(ty))
-        } else if let Some(ty) = UintTy::from_type_name(name) {
-            Some(UncertainIntTy::Unsigned(ty))
-        } else {
-            None
-        }
-    }
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum IntBitness {
+    Xsize,
+    X8,
+    X16,
+    X32,
+    X64,
+    X128,
+}
 
-    pub(crate) fn from_suffix(suffix: &str) -> Option<UncertainIntTy> {
-        if let Some(ty) = IntTy::from_suffix(suffix) {
-            Some(UncertainIntTy::Signed(ty))
-        } else if let Some(ty) = UintTy::from_suffix(suffix) {
-            Some(UncertainIntTy::Unsigned(ty))
-        } else {
-            None
-        }
-    }
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum FloatBitness {
+    X32,
+    X64,
+}
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum UncertainIntTy {
+    Unknown,
+    Known(IntTy),
 }
 
 impl fmt::Display for UncertainIntTy {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             UncertainIntTy::Unknown => write!(f, "{{integer}}"),
-            UncertainIntTy::Signed(ty) => write!(f, "{}", ty),
-            UncertainIntTy::Unsigned(ty) => write!(f, "{}", ty),
+            UncertainIntTy::Known(ty) => write!(f, "{}", ty),
         }
     }
 }
 
-#[derive(Debug, Clone, Eq, PartialEq, Hash, Copy)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
 pub enum UncertainFloatTy {
     Unknown,
     Known(FloatTy),
 }
 
-impl UncertainFloatTy {
-    pub(crate) fn from_type_name(name: &Name) -> Option<UncertainFloatTy> {
-        FloatTy::from_type_name(name).map(UncertainFloatTy::Known)
-    }
-
-    pub(crate) fn from_suffix(suffix: &str) -> Option<UncertainFloatTy> {
-        FloatTy::from_suffix(suffix).map(UncertainFloatTy::Known)
-    }
-}
-
 impl fmt::Display for UncertainFloatTy {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
@@ -66,14 +54,10 @@ impl fmt::Display for UncertainFloatTy {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Copy)]
-pub enum IntTy {
-    Isize,
-    I8,
-    I16,
-    I32,
-    I64,
-    I128,
+#[derive(Copy, Clone, Eq, PartialEq, Hash)]
+pub struct IntTy {
+    pub signedness: Signedness,
+    pub bitness: IntBitness,
 }
 
 impl fmt::Debug for IntTy {
@@ -84,104 +68,116 @@ impl fmt::Debug for IntTy {
 
 impl fmt::Display for IntTy {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let s = match *self {
-            IntTy::Isize => "isize",
-            IntTy::I8 => "i8",
-            IntTy::I16 => "i16",
-            IntTy::I32 => "i32",
-            IntTy::I64 => "i64",
-            IntTy::I128 => "i128",
-        };
-        write!(f, "{}", s)
+        write!(f, "{}", self.ty_to_string())
     }
 }
 
 impl IntTy {
-    fn from_type_name(name: &Name) -> Option<IntTy> {
-        match name.as_known_name()? {
-            KnownName::Isize => Some(IntTy::Isize),
-            KnownName::I8 => Some(IntTy::I8),
-            KnownName::I16 => Some(IntTy::I16),
-            KnownName::I32 => Some(IntTy::I32),
-            KnownName::I64 => Some(IntTy::I64),
-            KnownName::I128 => Some(IntTy::I128),
-            _ => None,
-        }
+    pub fn isize() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::Xsize }
     }
 
-    fn from_suffix(suffix: &str) -> Option<IntTy> {
-        match suffix {
-            "isize" => Some(IntTy::Isize),
-            "i8" => Some(IntTy::I8),
-            "i16" => Some(IntTy::I16),
-            "i32" => Some(IntTy::I32),
-            "i64" => Some(IntTy::I64),
-            "i128" => Some(IntTy::I128),
-            _ => None,
-        }
+    pub fn i8() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X8 }
     }
-}
 
-#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Copy)]
-pub enum UintTy {
-    Usize,
-    U8,
-    U16,
-    U32,
-    U64,
-    U128,
-}
+    pub fn i16() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X16 }
+    }
 
-impl fmt::Display for UintTy {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let s = match *self {
-            UintTy::Usize => "usize",
-            UintTy::U8 => "u8",
-            UintTy::U16 => "u16",
-            UintTy::U32 => "u32",
-            UintTy::U64 => "u64",
-            UintTy::U128 => "u128",
-        };
-        write!(f, "{}", s)
+    pub fn i32() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X32 }
     }
-}
 
-impl UintTy {
-    fn from_type_name(name: &Name) -> Option<UintTy> {
+    pub fn i64() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X64 }
+    }
+
+    pub fn i128() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X128 }
+    }
+
+    pub fn usize() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::Xsize }
+    }
+
+    pub fn u8() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X8 }
+    }
+
+    pub fn u16() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X16 }
+    }
+
+    pub fn u32() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X32 }
+    }
+
+    pub fn u64() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X64 }
+    }
+
+    pub fn u128() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X128 }
+    }
+
+    pub(crate) fn ty_to_string(&self) -> &'static str {
+        match (self.signedness, self.bitness) {
+            (Signedness::Signed, IntBitness::Xsize) => "isize",
+            (Signedness::Signed, IntBitness::X8) => "i8",
+            (Signedness::Signed, IntBitness::X16) => "i16",
+            (Signedness::Signed, IntBitness::X32) => "i32",
+            (Signedness::Signed, IntBitness::X64) => "i64",
+            (Signedness::Signed, IntBitness::X128) => "i128",
+            (Signedness::Unsigned, IntBitness::Xsize) => "usize",
+            (Signedness::Unsigned, IntBitness::X8) => "u8",
+            (Signedness::Unsigned, IntBitness::X16) => "u16",
+            (Signedness::Unsigned, IntBitness::X32) => "u32",
+            (Signedness::Unsigned, IntBitness::X64) => "u64",
+            (Signedness::Unsigned, IntBitness::X128) => "u128",
+        }
+    }
+
+    pub(crate) fn from_type_name(name: &Name) -> Option<IntTy> {
         match name.as_known_name()? {
-            KnownName::Usize => Some(UintTy::Usize),
-            KnownName::U8 => Some(UintTy::U8),
-            KnownName::U16 => Some(UintTy::U16),
-            KnownName::U32 => Some(UintTy::U32),
-            KnownName::U64 => Some(UintTy::U64),
-            KnownName::U128 => Some(UintTy::U128),
+            KnownName::Isize => Some(IntTy::isize()),
+            KnownName::I8 => Some(IntTy::i8()),
+            KnownName::I16 => Some(IntTy::i16()),
+            KnownName::I32 => Some(IntTy::i32()),
+            KnownName::I64 => Some(IntTy::i64()),
+            KnownName::I128 => Some(IntTy::i128()),
+            KnownName::Usize => Some(IntTy::usize()),
+            KnownName::U8 => Some(IntTy::u8()),
+            KnownName::U16 => Some(IntTy::u16()),
+            KnownName::U32 => Some(IntTy::u32()),
+            KnownName::U64 => Some(IntTy::u64()),
+            KnownName::U128 => Some(IntTy::u128()),
             _ => None,
         }
     }
 
-    fn from_suffix(suffix: &str) -> Option<UintTy> {
+    pub(crate) fn from_suffix(suffix: &str) -> Option<IntTy> {
         match suffix {
-            "usize" => Some(UintTy::Usize),
-            "u8" => Some(UintTy::U8),
-            "u16" => Some(UintTy::U16),
-            "u32" => Some(UintTy::U32),
-            "u64" => Some(UintTy::U64),
-            "u128" => Some(UintTy::U128),
+            "isize" => Some(IntTy::isize()),
+            "i8" => Some(IntTy::i8()),
+            "i16" => Some(IntTy::i16()),
+            "i32" => Some(IntTy::i32()),
+            "i64" => Some(IntTy::i64()),
+            "i128" => Some(IntTy::i128()),
+            "usize" => Some(IntTy::usize()),
+            "u8" => Some(IntTy::u8()),
+            "u16" => Some(IntTy::u16()),
+            "u32" => Some(IntTy::u32()),
+            "u64" => Some(IntTy::u64()),
+            "u128" => Some(IntTy::u128()),
             _ => None,
         }
     }
 }
 
-impl fmt::Debug for UintTy {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        fmt::Display::fmt(self, f)
-    }
-}
-
-#[derive(Clone, PartialEq, Eq, Hash, Copy, PartialOrd, Ord)]
-pub enum FloatTy {
-    F32,
-    F64,
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+pub struct FloatTy {
+    pub bitness: FloatBitness,
 }
 
 impl fmt::Debug for FloatTy {
@@ -197,25 +193,33 @@ impl fmt::Display for FloatTy {
 }
 
 impl FloatTy {
-    pub fn ty_to_string(self) -> &'static str {
-        match self {
-            FloatTy::F32 => "f32",
-            FloatTy::F64 => "f64",
+    pub fn f32() -> FloatTy {
+        FloatTy { bitness: FloatBitness::X32 }
+    }
+
+    pub fn f64() -> FloatTy {
+        FloatTy { bitness: FloatBitness::X64 }
+    }
+
+    pub(crate) fn ty_to_string(self) -> &'static str {
+        match self.bitness {
+            FloatBitness::X32 => "f32",
+            FloatBitness::X64 => "f64",
         }
     }
 
-    fn from_type_name(name: &Name) -> Option<FloatTy> {
+    pub(crate) fn from_type_name(name: &Name) -> Option<FloatTy> {
         match name.as_known_name()? {
-            KnownName::F32 => Some(FloatTy::F32),
-            KnownName::F64 => Some(FloatTy::F64),
+            KnownName::F32 => Some(FloatTy::f32()),
+            KnownName::F64 => Some(FloatTy::f64()),
             _ => None,
         }
     }
 
-    fn from_suffix(suffix: &str) -> Option<FloatTy> {
+    pub(crate) fn from_suffix(suffix: &str) -> Option<FloatTy> {
         match suffix {
-            "f32" => Some(FloatTy::F32),
-            "f64" => Some(FloatTy::F64),
+            "f32" => Some(FloatTy::f32()),
+            "f64" => Some(FloatTy::f64()),
             _ => None,
         }
     }