use crate::utils::{
- is_normalizable, last_path_segment, match_def_path, paths, snippet, span_lint, span_lint_and_sugg,
+ in_constant, is_normalizable, last_path_segment, match_def_path, paths, snippet, span_lint, span_lint_and_sugg,
span_lint_and_then, sugg,
};
use if_chain::if_chain;
if let Some(def_id) = cx.qpath_res(qpath, path_expr.hir_id).opt_def_id();
if match_def_path(cx, def_id, &paths::TRANSMUTE);
then {
+ // Avoid suggesting f32::(from|to)_bits in const contexts.
+ // See https://github.com/rust-lang/rust/issues/73736 for progress on making them `const fn`.
+ let const_context = in_constant(cx, e.hir_id);
+
let from_ty = cx.typeck_results().expr_ty(&args[0]);
let to_ty = cx.typeck_results().expr_ty(e);
},
)
},
- (ty::Int(_) | ty::Uint(_), ty::Float(_)) => span_lint_and_then(
+ (ty::Int(_) | ty::Uint(_), ty::Float(_)) if !const_context => span_lint_and_then(
cx,
TRANSMUTE_INT_TO_FLOAT,
e.span,
);
},
),
- (ty::Float(float_ty), ty::Int(_) | ty::Uint(_)) => span_lint_and_then(
+ (ty::Float(float_ty), ty::Int(_) | ty::Uint(_)) if !const_context => span_lint_and_then(
cx,
TRANSMUTE_FLOAT_TO_INT,
e.span,
error: transmute from a type (`&T`) to itself
- --> $DIR/transmute.rs:19:20
+ --> $DIR/transmute.rs:20:20
|
LL | let _: &'a T = core::intrinsics::transmute(t);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: `-D clippy::useless-transmute` implied by `-D warnings`
error: transmute from a reference to a pointer
- --> $DIR/transmute.rs:23:23
+ --> $DIR/transmute.rs:24:23
|
LL | let _: *const T = core::intrinsics::transmute(t);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T`
error: transmute from a reference to a pointer
- --> $DIR/transmute.rs:25:21
+ --> $DIR/transmute.rs:26:21
|
LL | let _: *mut T = core::intrinsics::transmute(t);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T as *mut T`
error: transmute from a reference to a pointer
- --> $DIR/transmute.rs:27:23
+ --> $DIR/transmute.rs:28:23
|
LL | let _: *const U = core::intrinsics::transmute(t);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T as *const U`
error: transmute from a type (`std::vec::Vec<i32>`) to itself
- --> $DIR/transmute.rs:33:27
+ --> $DIR/transmute.rs:34:27
|
LL | let _: Vec<i32> = core::intrinsics::transmute(my_vec());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: transmute from a type (`std::vec::Vec<i32>`) to itself
- --> $DIR/transmute.rs:35:27
+ --> $DIR/transmute.rs:36:27
|
LL | let _: Vec<i32> = core::mem::transmute(my_vec());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: transmute from a type (`std::vec::Vec<i32>`) to itself
- --> $DIR/transmute.rs:37:27
+ --> $DIR/transmute.rs:38:27
|
LL | let _: Vec<i32> = std::intrinsics::transmute(my_vec());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: transmute from a type (`std::vec::Vec<i32>`) to itself
- --> $DIR/transmute.rs:39:27
+ --> $DIR/transmute.rs:40:27
|
LL | let _: Vec<i32> = std::mem::transmute(my_vec());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: transmute from a type (`std::vec::Vec<i32>`) to itself
- --> $DIR/transmute.rs:41:27
+ --> $DIR/transmute.rs:42:27
|
LL | let _: Vec<i32> = my_transmute(my_vec());
| ^^^^^^^^^^^^^^^^^^^^^^
error: transmute from an integer to a pointer
- --> $DIR/transmute.rs:43:31
+ --> $DIR/transmute.rs:44:31
|
LL | let _: *const usize = std::mem::transmute(5_isize);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `5_isize as *const usize`
error: transmute from an integer to a pointer
- --> $DIR/transmute.rs:47:31
+ --> $DIR/transmute.rs:48:31
|
LL | let _: *const usize = std::mem::transmute(1 + 1usize);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `(1 + 1usize) as *const usize`
error: transmute from a type (`*const Usize`) to the type that it points to (`Usize`)
- --> $DIR/transmute.rs:62:24
+ --> $DIR/transmute.rs:63:24
|
LL | let _: Usize = core::intrinsics::transmute(int_const_ptr);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: `-D clippy::crosspointer-transmute` implied by `-D warnings`
error: transmute from a type (`*mut Usize`) to the type that it points to (`Usize`)
- --> $DIR/transmute.rs:64:24
+ --> $DIR/transmute.rs:65:24
|
LL | let _: Usize = core::intrinsics::transmute(int_mut_ptr);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: transmute from a type (`Usize`) to a pointer to that type (`*const Usize`)
- --> $DIR/transmute.rs:66:31
+ --> $DIR/transmute.rs:67:31
|
LL | let _: *const Usize = core::intrinsics::transmute(my_int());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: transmute from a type (`Usize`) to a pointer to that type (`*mut Usize`)
- --> $DIR/transmute.rs:68:29
+ --> $DIR/transmute.rs:69:29
|
LL | let _: *mut Usize = core::intrinsics::transmute(my_int());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: transmute from a `u32` to a `char`
- --> $DIR/transmute.rs:74:28
+ --> $DIR/transmute.rs:75:28
|
LL | let _: char = unsafe { std::mem::transmute(0_u32) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::char::from_u32(0_u32).unwrap()`
= note: `-D clippy::transmute-int-to-char` implied by `-D warnings`
error: transmute from a `i32` to a `char`
- --> $DIR/transmute.rs:75:28
+ --> $DIR/transmute.rs:76:28
|
LL | let _: char = unsafe { std::mem::transmute(0_i32) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::char::from_u32(0_i32 as u32).unwrap()`
error: transmute from a `u8` to a `bool`
- --> $DIR/transmute.rs:80:28
+ --> $DIR/transmute.rs:81:28
|
LL | let _: bool = unsafe { std::mem::transmute(0_u8) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `0_u8 != 0`
= note: `-D clippy::transmute-int-to-bool` implied by `-D warnings`
error: transmute from a `u32` to a `f32`
- --> $DIR/transmute.rs:85:27
+ --> $DIR/transmute.rs:87:31
|
-LL | let _: f32 = unsafe { std::mem::transmute(0_u32) };
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `f32::from_bits(0_u32)`
+LL | let _: f32 = unsafe { std::mem::transmute(0_u32) };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `f32::from_bits(0_u32)`
|
= note: `-D clippy::transmute-int-to-float` implied by `-D warnings`
error: transmute from a `i32` to a `f32`
- --> $DIR/transmute.rs:86:27
+ --> $DIR/transmute.rs:88:31
|
-LL | let _: f32 = unsafe { std::mem::transmute(0_i32) };
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `f32::from_bits(0_i32 as u32)`
+LL | let _: f32 = unsafe { std::mem::transmute(0_i32) };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `f32::from_bits(0_i32 as u32)`
error: transmute from a `&[u8]` to a `&str`
- --> $DIR/transmute.rs:90:28
+ --> $DIR/transmute.rs:99:28
|
LL | let _: &str = unsafe { std::mem::transmute(b) };
| ^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::str::from_utf8(b).unwrap()`
= note: `-D clippy::transmute-bytes-to-str` implied by `-D warnings`
error: transmute from a `&mut [u8]` to a `&mut str`
- --> $DIR/transmute.rs:91:32
+ --> $DIR/transmute.rs:100:32
|
LL | let _: &mut str = unsafe { std::mem::transmute(mb) };
| ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::str::from_utf8_mut(mb).unwrap()`
error: transmute from a `f32` to a `u32`
- --> $DIR/transmute_float_to_int.rs:4:27
+ --> $DIR/transmute_float_to_int.rs:5:27
|
LL | let _: u32 = unsafe { std::mem::transmute(1f32) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1f32.to_bits()`
= note: `-D clippy::transmute-float-to-int` implied by `-D warnings`
error: transmute from a `f32` to a `i32`
- --> $DIR/transmute_float_to_int.rs:5:27
+ --> $DIR/transmute_float_to_int.rs:6:27
|
LL | let _: i32 = unsafe { std::mem::transmute(1f32) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1f32.to_bits() as i32`
error: transmute from a `f64` to a `u64`
- --> $DIR/transmute_float_to_int.rs:6:27
+ --> $DIR/transmute_float_to_int.rs:7:27
|
LL | let _: u64 = unsafe { std::mem::transmute(1f64) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1f64.to_bits()`
error: transmute from a `f64` to a `i64`
- --> $DIR/transmute_float_to_int.rs:7:27
+ --> $DIR/transmute_float_to_int.rs:8:27
|
LL | let _: i64 = unsafe { std::mem::transmute(1f64) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1f64.to_bits() as i64`
error: transmute from a `f64` to a `u64`
- --> $DIR/transmute_float_to_int.rs:8:27
+ --> $DIR/transmute_float_to_int.rs:9:27
|
LL | let _: u64 = unsafe { std::mem::transmute(1.0) };
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1.0f64.to_bits()`
error: transmute from a `f64` to a `u64`
- --> $DIR/transmute_float_to_int.rs:9:27
+ --> $DIR/transmute_float_to_int.rs:10:27
|
LL | let _: u64 = unsafe { std::mem::transmute(-1.0) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(-1.0f64).to_bits()`