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core: Make pointer offset methods "const fn"

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Signed-off-by: Joe Richey <joerichey@google.com>
This commit is contained in:
Joe Richey 2020-04-24 00:19:11 -07:00
parent 08df3116e9
commit 9b3dfd8ea9
4 changed files with 27 additions and 12 deletions
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2
src/libcore/intrinsics.rs
View File

@ -1314,6 +1314,7 @@ extern "rust-intrinsic" {
/// The stabilized version of this intrinsic is
/// [`std::pointer::offset`](../../std/primitive.pointer.html#method.offset).
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
pub fn offset<T>(dst: *const T, offset: isize) -> *const T;
/// Calculates the offset from a pointer, potentially wrapping.
@ -1331,6 +1332,7 @@ extern "rust-intrinsic" {
/// The stabilized version of this intrinsic is
/// [`std::pointer::wrapping_offset`](../../std/primitive.pointer.html#method.wrapping_offset).
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
pub fn arith_offset<T>(dst: *const T, offset: isize) -> *const T;
/// Equivalent to the appropriate `llvm.memcpy.p0i8.0i8.*` intrinsic, with

1
src/libcore/lib.rs
View File

@ -85,6 +85,7 @@
#![feature(const_panic)]
#![feature(const_fn_union)]
#![feature(const_generics)]
#![feature(const_ptr_offset)]
#![feature(const_ptr_offset_from)]
#![feature(const_result)]
#![feature(const_slice_from_raw_parts)]

18
src/libcore/ptr/const_ptr.rs
View File

@ -151,8 +151,9 @@ impl<T: ?Sized> *const T {
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub unsafe fn offset(self, count: isize) -> *const T
pub const unsafe fn offset(self, count: isize) -> *const T
where
T: Sized,
{
@ -210,8 +211,9 @@ impl<T: ?Sized> *const T {
/// ```
#[stable(feature = "ptr_wrapping_offset", since = "1.16.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn wrapping_offset(self, count: isize) -> *const T
pub const fn wrapping_offset(self, count: isize) -> *const T
where
T: Sized,
{
@ -393,8 +395,9 @@ impl<T: ?Sized> *const T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub unsafe fn add(self, count: usize) -> Self
pub const unsafe fn add(self, count: usize) -> Self
where
T: Sized,
{
@ -455,8 +458,9 @@ impl<T: ?Sized> *const T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub unsafe fn sub(self, count: usize) -> Self
pub const unsafe fn sub(self, count: usize) -> Self
where
T: Sized,
{
@ -511,8 +515,9 @@ impl<T: ?Sized> *const T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn wrapping_add(self, count: usize) -> Self
pub const fn wrapping_add(self, count: usize) -> Self
where
T: Sized,
{
@ -567,8 +572,9 @@ impl<T: ?Sized> *const T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn wrapping_sub(self, count: usize) -> Self
pub const fn wrapping_sub(self, count: usize) -> Self
where
T: Sized,
{

18
src/libcore/ptr/mut_ptr.rs
View File

@ -145,8 +145,9 @@ impl<T: ?Sized> *mut T {
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub unsafe fn offset(self, count: isize) -> *mut T
pub const unsafe fn offset(self, count: isize) -> *mut T
where
T: Sized,
{
@ -203,8 +204,9 @@ impl<T: ?Sized> *mut T {
/// ```
#[stable(feature = "ptr_wrapping_offset", since = "1.16.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn wrapping_offset(self, count: isize) -> *mut T
pub const fn wrapping_offset(self, count: isize) -> *mut T
where
T: Sized,
{
@ -439,8 +441,9 @@ impl<T: ?Sized> *mut T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub unsafe fn add(self, count: usize) -> Self
pub const unsafe fn add(self, count: usize) -> Self
where
T: Sized,
{
@ -501,8 +504,9 @@ impl<T: ?Sized> *mut T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub unsafe fn sub(self, count: usize) -> Self
pub const unsafe fn sub(self, count: usize) -> Self
where
T: Sized,
{
@ -557,8 +561,9 @@ impl<T: ?Sized> *mut T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn wrapping_add(self, count: usize) -> Self
pub const fn wrapping_add(self, count: usize) -> Self
where
T: Sized,
{
@ -613,8 +618,9 @@ impl<T: ?Sized> *mut T {
/// ```
#[stable(feature = "pointer_methods", since = "1.26.0")]
#[must_use = "returns a new pointer rather than modifying its argument"]
#[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
#[inline]
pub fn wrapping_sub(self, count: usize) -> Self
pub const fn wrapping_sub(self, count: usize) -> Self
where
T: Sized,
{