Move numeric `From` and `TryFrom` impls to `libcore/convert/num.rs`

This makes `libcore/num/mod.rs` slightly smaller. It’s still 4911 lines and not easy to navigate. This doesn’t change any public API.

1 files changed, 1 insertions, 330 deletions

diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 4313248f263..585f144cf8a 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -4,7 +4,6 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use crate::convert::TryFrom;
 use crate::fmt;
 use crate::intrinsics;
 use crate::mem;
@@ -4701,7 +4700,7 @@ from_str_radix_int_impl! { isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128 }
 /// The error type returned when a checked integral type conversion fails.
 #[stable(feature = "try_from", since = "1.34.0")]
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
-pub struct TryFromIntError(());
+pub struct TryFromIntError(pub(crate) ());
 
 impl TryFromIntError {
     #[unstable(feature = "int_error_internals",
@@ -4728,206 +4727,6 @@ impl From<!> for TryFromIntError {
     }
 }
 
-// no possible bounds violation
-macro_rules! try_from_unbounded {
-    ($source:ty, $($target:ty),*) => {$(
-        #[stable(feature = "try_from", since = "1.34.0")]
-        impl TryFrom<$source> for $target {
-            type Error = TryFromIntError;
-
-            /// Try to create the target number type from a source
-            /// number type. This returns an error if the source value
-            /// is outside of the range of the target type.
-            #[inline]
-            fn try_from(value: $source) -> Result<Self, Self::Error> {
-                Ok(value as $target)
-            }
-        }
-    )*}
-}
-
-// only negative bounds
-macro_rules! try_from_lower_bounded {
-    ($source:ty, $($target:ty),*) => {$(
-        #[stable(feature = "try_from", since = "1.34.0")]
-        impl TryFrom<$source> for $target {
-            type Error = TryFromIntError;
-
-            /// Try to create the target number type from a source
-            /// number type. This returns an error if the source value
-            /// is outside of the range of the target type.
-            #[inline]
-            fn try_from(u: $source) -> Result<$target, TryFromIntError> {
-                if u >= 0 {
-                    Ok(u as $target)
-                } else {
-                    Err(TryFromIntError(()))
-                }
-            }
-        }
-    )*}
-}
-
-// unsigned to signed (only positive bound)
-macro_rules! try_from_upper_bounded {
-    ($source:ty, $($target:ty),*) => {$(
-        #[stable(feature = "try_from", since = "1.34.0")]
-        impl TryFrom<$source> for $target {
-            type Error = TryFromIntError;
-
-            /// Try to create the target number type from a source
-            /// number type. This returns an error if the source value
-            /// is outside of the range of the target type.
-            #[inline]
-            fn try_from(u: $source) -> Result<$target, TryFromIntError> {
-                if u > (<$target>::max_value() as $source) {
-                    Err(TryFromIntError(()))
-                } else {
-                    Ok(u as $target)
-                }
-            }
-        }
-    )*}
-}
-
-// all other cases
-macro_rules! try_from_both_bounded {
-    ($source:ty, $($target:ty),*) => {$(
-        #[stable(feature = "try_from", since = "1.34.0")]
-        impl TryFrom<$source> for $target {
-            type Error = TryFromIntError;
-
-            /// Try to create the target number type from a source
-            /// number type. This returns an error if the source value
-            /// is outside of the range of the target type.
-            #[inline]
-            fn try_from(u: $source) -> Result<$target, TryFromIntError> {
-                let min = <$target>::min_value() as $source;
-                let max = <$target>::max_value() as $source;
-                if u < min || u > max {
-                    Err(TryFromIntError(()))
-                } else {
-                    Ok(u as $target)
-                }
-            }
-        }
-    )*}
-}
-
-macro_rules! rev {
-    ($mac:ident, $source:ty, $($target:ty),*) => {$(
-        $mac!($target, $source);
-    )*}
-}
-
-// intra-sign conversions
-try_from_upper_bounded!(u16, u8);
-try_from_upper_bounded!(u32, u16, u8);
-try_from_upper_bounded!(u64, u32, u16, u8);
-try_from_upper_bounded!(u128, u64, u32, u16, u8);
-
-try_from_both_bounded!(i16, i8);
-try_from_both_bounded!(i32, i16, i8);
-try_from_both_bounded!(i64, i32, i16, i8);
-try_from_both_bounded!(i128, i64, i32, i16, i8);
-
-// unsigned-to-signed
-try_from_upper_bounded!(u8, i8);
-try_from_upper_bounded!(u16, i8, i16);
-try_from_upper_bounded!(u32, i8, i16, i32);
-try_from_upper_bounded!(u64, i8, i16, i32, i64);
-try_from_upper_bounded!(u128, i8, i16, i32, i64, i128);
-
-// signed-to-unsigned
-try_from_lower_bounded!(i8, u8, u16, u32, u64, u128);
-try_from_lower_bounded!(i16, u16, u32, u64, u128);
-try_from_lower_bounded!(i32, u32, u64, u128);
-try_from_lower_bounded!(i64, u64, u128);
-try_from_lower_bounded!(i128, u128);
-try_from_both_bounded!(i16, u8);
-try_from_both_bounded!(i32, u16, u8);
-try_from_both_bounded!(i64, u32, u16, u8);
-try_from_both_bounded!(i128, u64, u32, u16, u8);
-
-// usize/isize
-try_from_upper_bounded!(usize, isize);
-try_from_lower_bounded!(isize, usize);
-
-#[cfg(target_pointer_width = "16")]
-mod ptr_try_from_impls {
-    use super::TryFromIntError;
-    use crate::convert::TryFrom;
-
-    try_from_upper_bounded!(usize, u8);
-    try_from_unbounded!(usize, u16, u32, u64, u128);
-    try_from_upper_bounded!(usize, i8, i16);
-    try_from_unbounded!(usize, i32, i64, i128);
-
-    try_from_both_bounded!(isize, u8);
-    try_from_lower_bounded!(isize, u16, u32, u64, u128);
-    try_from_both_bounded!(isize, i8);
-    try_from_unbounded!(isize, i16, i32, i64, i128);
-
-    rev!(try_from_upper_bounded, usize, u32, u64, u128);
-    rev!(try_from_lower_bounded, usize, i8, i16);
-    rev!(try_from_both_bounded, usize, i32, i64, i128);
-
-    rev!(try_from_upper_bounded, isize, u16, u32, u64, u128);
-    rev!(try_from_both_bounded, isize, i32, i64, i128);
-}
-
-#[cfg(target_pointer_width = "32")]
-mod ptr_try_from_impls {
-    use super::TryFromIntError;
-    use crate::convert::TryFrom;
-
-    try_from_upper_bounded!(usize, u8, u16);
-    try_from_unbounded!(usize, u32, u64, u128);
-    try_from_upper_bounded!(usize, i8, i16, i32);
-    try_from_unbounded!(usize, i64, i128);
-
-    try_from_both_bounded!(isize, u8, u16);
-    try_from_lower_bounded!(isize, u32, u64, u128);
-    try_from_both_bounded!(isize, i8, i16);
-    try_from_unbounded!(isize, i32, i64, i128);
-
-    rev!(try_from_unbounded, usize, u32);
-    rev!(try_from_upper_bounded, usize, u64, u128);
-    rev!(try_from_lower_bounded, usize, i8, i16, i32);
-    rev!(try_from_both_bounded, usize, i64, i128);
-
-    rev!(try_from_unbounded, isize, u16);
-    rev!(try_from_upper_bounded, isize, u32, u64, u128);
-    rev!(try_from_unbounded, isize, i32);
-    rev!(try_from_both_bounded, isize, i64, i128);
-}
-
-#[cfg(target_pointer_width = "64")]
-mod ptr_try_from_impls {
-    use super::TryFromIntError;
-    use crate::convert::TryFrom;
-
-    try_from_upper_bounded!(usize, u8, u16, u32);
-    try_from_unbounded!(usize, u64, u128);
-    try_from_upper_bounded!(usize, i8, i16, i32, i64);
-    try_from_unbounded!(usize, i128);
-
-    try_from_both_bounded!(isize, u8, u16, u32);
-    try_from_lower_bounded!(isize, u64, u128);
-    try_from_both_bounded!(isize, i8, i16, i32);
-    try_from_unbounded!(isize, i64, i128);
-
-    rev!(try_from_unbounded, usize, u32, u64);
-    rev!(try_from_upper_bounded, usize, u128);
-    rev!(try_from_lower_bounded, usize, i8, i16, i32, i64);
-    rev!(try_from_both_bounded, usize, i128);
-
-    rev!(try_from_unbounded, isize, u16, u32);
-    rev!(try_from_upper_bounded, isize, u64, u128);
-    rev!(try_from_unbounded, isize, i32, i64);
-    rev!(try_from_both_bounded, isize, i128);
-}
-
 #[doc(hidden)]
 trait FromStrRadixHelper: PartialOrd + Copy {
     fn min_value() -> Self;
@@ -5110,131 +4909,3 @@ impl fmt::Display for ParseIntError {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use crate::num::dec2flt::ParseFloatError;
-
-// Conversion traits for primitive integer and float types
-// Conversions T -> T are covered by a blanket impl and therefore excluded
-// Some conversions from and to usize/isize are not implemented due to portability concerns
-macro_rules! impl_from {
-    ($Small: ty, $Large: ty, #[$attr:meta], $doc: expr) => {
-        #[$attr]
-        #[doc = $doc]
-        impl From<$Small> for $Large {
-            #[inline]
-            fn from(small: $Small) -> $Large {
-                small as $Large
-            }
-        }
-    };
-    ($Small: ty, $Large: ty, #[$attr:meta]) => {
-        impl_from!($Small,
-                   $Large,
-                   #[$attr],
-                   concat!("Converts `",
-                           stringify!($Small),
-                           "` to `",
-                           stringify!($Large),
-                           "` losslessly."));
-    }
-}
-
-macro_rules! impl_from_bool {
-    ($target: ty, #[$attr:meta]) => {
-        impl_from!(bool, $target, #[$attr], concat!("Converts a `bool` to a `",
-            stringify!($target), "`. The resulting value is `0` for `false` and `1` for `true`
-values.
-
-# Examples
-
-```
-assert_eq!(", stringify!($target), "::from(true), 1);
-assert_eq!(", stringify!($target), "::from(false), 0);
-```"));
-    };
-}
-
-// Bool -> Any
-impl_from_bool! { u8, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { u16, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { u32, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { u64, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { u128, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { usize, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { i8, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { i16, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { i32, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { i64, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { i128, #[stable(feature = "from_bool", since = "1.28.0")] }
-impl_from_bool! { isize, #[stable(feature = "from_bool", since = "1.28.0")] }
-
-// Unsigned -> Unsigned
-impl_from! { u8, u16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, u128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { u8, usize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u16, u32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u16, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u16, u128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { u32, u64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u32, u128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { u64, u128, #[stable(feature = "i128", since = "1.26.0")] }
-
-// Signed -> Signed
-impl_from! { i8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i8, i128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { i8, isize, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i16, i128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { i32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { i32, i128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { i64, i128, #[stable(feature = "i128", since = "1.26.0")] }
-
-// Unsigned -> Signed
-impl_from! { u8, i16, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u8, i128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { u16, i32, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u16, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u16, i128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { u32, i64, #[stable(feature = "lossless_int_conv", since = "1.5.0")] }
-impl_from! { u32, i128, #[stable(feature = "i128", since = "1.26.0")] }
-impl_from! { u64, i128, #[stable(feature = "i128", since = "1.26.0")] }
-
-// The C99 standard defines bounds on INTPTR_MIN, INTPTR_MAX, and UINTPTR_MAX
-// which imply that pointer-sized integers must be at least 16 bits:
-// https://port70.net/~nsz/c/c99/n1256.html#7.18.2.4
-impl_from! { u16, usize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
-impl_from! { u8, isize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
-impl_from! { i16, isize, #[stable(feature = "lossless_iusize_conv", since = "1.26.0")] }
-
-// RISC-V defines the possibility of a 128-bit address space (RV128).
-
-// CHERI proposes 256-bit “capabilities”. Unclear if this would be relevant to usize/isize.
-// https://www.cl.cam.ac.uk/research/security/ctsrd/pdfs/20171017a-cheri-poster.pdf
-// http://www.csl.sri.com/users/neumann/2012resolve-cheri.pdf
-
-
-// Note: integers can only be represented with full precision in a float if
-// they fit in the significand, which is 24 bits in f32 and 53 bits in f64.
-// Lossy float conversions are not implemented at this time.
-
-// Signed -> Float
-impl_from! { i8, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { i8, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { i16, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { i16, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { i32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-
-// Unsigned -> Float
-impl_from! { u8, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { u8, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { u16, f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { u16, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-impl_from! { u32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
-
-// Float -> Float
-impl_from! { f32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }