79ef13592e
Added some more cases to the test, and implemented a new lint, cast_possible_wrap, triggered when casting from an unsigned type to a signed type of the same size.
63 lines
4.7 KiB
Rust
63 lines
4.7 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#[deny(cast_precision_loss, cast_possible_truncation, cast_sign_loss, cast_possible_wrap)]
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fn main() {
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// Test cast_precision_loss
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1i32 as f32; //~ERROR casting i32 to f32 causes a loss of precision (i32 is 32 bits wide, but f32's mantissa is only 23 bits wide)
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1i64 as f32; //~ERROR casting i64 to f32 causes a loss of precision (i64 is 64 bits wide, but f32's mantissa is only 23 bits wide)
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1i64 as f64; //~ERROR casting i64 to f64 causes a loss of precision (i64 is 64 bits wide, but f64's mantissa is only 52 bits wide)
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1u32 as f32; //~ERROR casting u32 to f32 causes a loss of precision (u32 is 32 bits wide, but f32's mantissa is only 23 bits wide)
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1u64 as f32; //~ERROR casting u64 to f32 causes a loss of precision (u64 is 64 bits wide, but f32's mantissa is only 23 bits wide)
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1u64 as f64; //~ERROR casting u64 to f64 causes a loss of precision (u64 is 64 bits wide, but f64's mantissa is only 52 bits wide)
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1i32 as f64; // Should not trigger the lint
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1u32 as f64; // Should not trigger the lint
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// Test cast_possible_truncation
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1f32 as i32; //~ERROR casting f32 to i32 may truncate the value
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1f32 as u32; //~ERROR casting f32 to u32 may truncate the value
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//~^ERROR casting f32 to u32 may lose the sign of the value
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1f64 as f32; //~ERROR casting f64 to f32 may truncate the value
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1i32 as i8; //~ERROR casting i32 to i8 may truncate the value
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1i32 as u8; //~ERROR casting i32 to u8 may truncate the value
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//~^ERROR casting i32 to u8 may lose the sign of the value
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1f64 as isize; //~ERROR casting f64 to isize may truncate the value
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1f64 as usize; //~ERROR casting f64 to usize may truncate the value
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//~^ERROR casting f64 to usize may lose the sign of the value
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// Test cast_possible_wrap
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1u8 as i8; //~ERROR casting u8 to i8 may wrap around the value
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1u16 as i16; //~ERROR casting u16 to i16 may wrap around the value
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1u32 as i32; //~ERROR casting u32 to i32 may wrap around the value
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1u64 as i64; //~ERROR casting u64 to i64 may wrap around the value
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1usize as isize; //~ERROR casting usize to isize may wrap around the value
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// Test cast_sign_loss
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1i32 as u32; //~ERROR casting i32 to u32 may lose the sign of the value
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1isize as usize; //~ERROR casting isize to usize may lose the sign of the value
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// Extra checks for *size
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// Casting from *size
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1isize as i8; //~ERROR casting isize to i8 may truncate the value
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1isize as f64; //~ERROR casting isize to f64 causes a loss of precision on targets with 64-bit wide pointers (isize is 64 bits wide, but f64's mantissa is only 52 bits wide)
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1usize as f64; //~ERROR casting usize to f64 causes a loss of precision on targets with 64-bit wide pointers (usize is 64 bits wide, but f64's mantissa is only 52 bits wide)
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1isize as f32; //~ERROR casting isize to f32 causes a loss of precision (isize is 32 or 64 bits wide, but f32's mantissa is only 23 bits wide)
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1usize as f32; //~ERROR casting usize to f32 causes a loss of precision (usize is 32 or 64 bits wide, but f32's mantissa is only 23 bits wide)
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1isize as i32; //~ERROR casting isize to i32 may truncate the value on targets with 64-bit wide pointers
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1isize as u32; //~ERROR casting isize to u32 may lose the sign of the value
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//~^ERROR casting isize to u32 may truncate the value on targets with 64-bit wide pointers
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1usize as u32; //~ERROR casting usize to u32 may truncate the value on targets with 64-bit wide pointers
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1usize as i32; //~ERROR casting usize to i32 may truncate the value on targets with 64-bit wide pointers
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//~^ERROR casting usize to i32 may wrap around the value on targets with 32-bit wide pointers
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// Casting to *size
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1i64 as isize; //~ERROR casting i64 to isize may truncate the value on targets with 32-bit wide pointers
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1i64 as usize; //~ERROR casting i64 to usize may truncate the value on targets with 32-bit wide pointers
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//~^ERROR casting i64 to usize may lose the sign of the value
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1u64 as isize; //~ERROR casting u64 to isize may truncate the value on targets with 32-bit wide pointers
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//~^ERROR casting u64 to isize may wrap around the value on targets with 64-bit wide pointers
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1u64 as usize; //~ERROR casting u64 to usize may truncate the value on targets with 32-bit wide pointers
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1u32 as isize; //~ERROR casting u32 to isize may wrap around the value on targets with 32-bit wide pointers
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1u32 as usize; // Should not trigger any lint
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1i32 as isize; // Neither should this
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1i32 as usize; //~ERROR casting i32 to usize may lose the sign of the value
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} |