diff --git a/clippy_lints/src/checked_conversions.rs b/clippy_lints/src/checked_conversions.rs index d9776dd50a836..e845ef99c7cc0 100644 --- a/clippy_lints/src/checked_conversions.rs +++ b/clippy_lints/src/checked_conversions.rs @@ -58,24 +58,18 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for CheckedConversions { } }; - if_chain! { - if let Some(cv) = result; - if let Some(to_type) = cv.to_type; - - then { + if let Some(cv) = result { + if let Some(to_type) = cv.to_type { let mut applicability = Applicability::MachineApplicable; - let snippet = snippet_with_applicability(cx, cv.expr_to_cast.span, "_", &mut - applicability); + let snippet = snippet_with_applicability(cx, cv.expr_to_cast.span, "_", &mut applicability); span_lint_and_sugg( cx, CHECKED_CONVERSIONS, item.span, "Checked cast can be simplified.", "try", - format!("{}::try_from({}).is_ok()", - to_type, - snippet), - applicability + format!("{}::try_from({}).is_ok()", to_type, snippet), + applicability, ); } } @@ -184,7 +178,7 @@ fn check_upper_bound<'tcx>(expr: &'tcx Expr<'tcx>) -> Option> { if_chain! { if let ExprKind::Binary(ref op, ref left, ref right) = &expr.kind; if let Some((candidate, check)) = normalize_le_ge(op, left, right); - if let Some((from, to)) = get_types_from_cast(check, MAX_VALUE, INTS); + if let Some((from, to)) = get_types_from_cast(check, INTS, "max_value", "MAX"); then { Conversion::try_new(candidate, from, to) @@ -224,7 +218,7 @@ fn check_lower_bound_zero<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> O /// Check for `expr >= (to_type::MIN as from_type)` fn check_lower_bound_min<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> Option> { - if let Some((from, to)) = get_types_from_cast(check, MIN_VALUE, SINTS) { + if let Some((from, to)) = get_types_from_cast(check, SINTS, "min_value", "MIN") { Conversion::try_new(candidate, from, to) } else { None @@ -232,10 +226,16 @@ fn check_lower_bound_min<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> Op } /// Tries to extract the from- and to-type from a cast expression -fn get_types_from_cast<'a>(expr: &'a Expr<'_>, func: &'a str, types: &'a [&str]) -> Option<(&'a str, &'a str)> { - // `to_type::maxmin_value() as from_type` +fn get_types_from_cast<'a>( + expr: &'a Expr<'_>, + types: &'a [&str], + func: &'a str, + assoc_const: &'a str, +) -> Option<(&'a str, &'a str)> { + // `to_type::max_value() as from_type` + // or `to_type::MAX as from_type` let call_from_cast: Option<(&Expr<'_>, &str)> = if_chain! { - // to_type::maxmin_value(), from_type + // to_type::max_value(), from_type if let ExprKind::Cast(ref limit, ref from_type) = &expr.kind; if let TyKind::Path(ref from_type_path) = &from_type.kind; if let Some(from_sym) = int_ty_to_sym(from_type_path); @@ -247,17 +247,17 @@ fn get_types_from_cast<'a>(expr: &'a Expr<'_>, func: &'a str, types: &'a [&str]) } }; - // `from_type::from(to_type::maxmin_value())` + // `from_type::from(to_type::max_value())` let limit_from: Option<(&Expr<'_>, &str)> = call_from_cast.or_else(|| { if_chain! { - // `from_type::from, to_type::maxmin_value()` + // `from_type::from, to_type::max_value()` if let ExprKind::Call(ref from_func, ref args) = &expr.kind; - // `to_type::maxmin_value()` + // `to_type::max_value()` if args.len() == 1; if let limit = &args[0]; // `from_type::from` if let ExprKind::Path(ref path) = &from_func.kind; - if let Some(from_sym) = get_implementing_type(path, INTS, FROM); + if let Some(from_sym) = get_implementing_type(path, INTS, "from"); then { Some((limit, from_sym)) @@ -268,22 +268,26 @@ fn get_types_from_cast<'a>(expr: &'a Expr<'_>, func: &'a str, types: &'a [&str]) }); if let Some((limit, from_type)) = limit_from { - if_chain! { - if let ExprKind::Call(ref fun_name, _) = &limit.kind; - // `to_type, maxmin_value` - if let ExprKind::Path(ref path) = &fun_name.kind; - // `to_type` - if let Some(to_type) = get_implementing_type(path, types, func); - - then { - Some((from_type, to_type)) - } else { - None - } + match limit.kind { + // `from_type::from(_)` + ExprKind::Call(path, _) => { + if let ExprKind::Path(ref path) = path.kind { + // `to_type` + if let Some(to_type) = get_implementing_type(path, types, func) { + return Some((from_type, to_type)); + } + } + }, + // `to_type::MAX` + ExprKind::Path(ref path) => { + if let Some(to_type) = get_implementing_type(path, types, assoc_const) { + return Some((from_type, to_type)); + } + }, + _ => {}, } - } else { - None - } + }; + None } /// Gets the type which implements the called function @@ -336,10 +340,6 @@ fn normalize_le_ge<'a>(op: &BinOp, left: &'a Expr<'a>, right: &'a Expr<'a>) -> O } // Constants -const FROM: &str = "from"; -const MAX_VALUE: &str = "max_value"; -const MIN_VALUE: &str = "min_value"; - const UINTS: &[&str] = &["u8", "u16", "u32", "u64", "usize"]; const SINTS: &[&str] = &["i8", "i16", "i32", "i64", "isize"]; const INTS: &[&str] = &["u8", "u16", "u32", "u64", "usize", "i8", "i16", "i32", "i64", "isize"]; diff --git a/tests/ui/checked_conversions.fixed b/tests/ui/checked_conversions.fixed index 7febd6f376135..12290db3dcf52 100644 --- a/tests/ui/checked_conversions.fixed +++ b/tests/ui/checked_conversions.fixed @@ -1,106 +1,76 @@ // run-rustfix +#![allow( + clippy::cast_lossless, + // Int::max_value will be deprecated in the future + deprecated, +)] #![warn(clippy::checked_conversions)] -#![allow(clippy::cast_lossless)] -#![allow(dead_code)] + use std::convert::TryFrom; // Positive tests // Signed to unsigned -fn i64_to_u32(value: i64) -> Option { - if u32::try_from(value).is_ok() { - Some(value as u32) - } else { - None - } +pub fn i64_to_u32(value: i64) { + let _ = u32::try_from(value).is_ok(); + let _ = u32::try_from(value).is_ok(); } -fn i64_to_u16(value: i64) -> Option { - if u16::try_from(value).is_ok() { - Some(value as u16) - } else { - None - } +pub fn i64_to_u16(value: i64) { + let _ = u16::try_from(value).is_ok(); + let _ = u16::try_from(value).is_ok(); } -fn isize_to_u8(value: isize) -> Option { - if u8::try_from(value).is_ok() { - Some(value as u8) - } else { - None - } +pub fn isize_to_u8(value: isize) { + let _ = u8::try_from(value).is_ok(); + let _ = u8::try_from(value).is_ok(); } // Signed to signed -fn i64_to_i32(value: i64) -> Option { - if i32::try_from(value).is_ok() { - Some(value as i32) - } else { - None - } +pub fn i64_to_i32(value: i64) { + let _ = i32::try_from(value).is_ok(); + let _ = i32::try_from(value).is_ok(); } -fn i64_to_i16(value: i64) -> Option { - if i16::try_from(value).is_ok() { - Some(value as i16) - } else { - None - } +pub fn i64_to_i16(value: i64) { + let _ = i16::try_from(value).is_ok(); + let _ = i16::try_from(value).is_ok(); } // Unsigned to X -fn u32_to_i32(value: u32) -> Option { - if i32::try_from(value).is_ok() { - Some(value as i32) - } else { - None - } +pub fn u32_to_i32(value: u32) { + let _ = i32::try_from(value).is_ok(); + let _ = i32::try_from(value).is_ok(); } -fn usize_to_isize(value: usize) -> isize { - if isize::try_from(value).is_ok() && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn usize_to_isize(value: usize) { + let _ = isize::try_from(value).is_ok() && value as i32 == 5; + let _ = isize::try_from(value).is_ok() && value as i32 == 5; } -fn u32_to_u16(value: u32) -> isize { - if u16::try_from(value).is_ok() && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn u32_to_u16(value: u32) { + let _ = u16::try_from(value).is_ok() && value as i32 == 5; + let _ = u16::try_from(value).is_ok() && value as i32 == 5; } // Negative tests -fn no_i64_to_i32(value: i64) -> Option { - if value <= (i32::max_value() as i64) && value >= 0 { - Some(value as i32) - } else { - None - } +pub fn no_i64_to_i32(value: i64) { + let _ = value <= (i32::max_value() as i64) && value >= 0; + let _ = value <= (i32::MAX as i64) && value >= 0; } -fn no_isize_to_u8(value: isize) -> Option { - if value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize) { - Some(value as u8) - } else { - None - } +pub fn no_isize_to_u8(value: isize) { + let _ = value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize); + let _ = value <= (u8::MAX as isize) && value >= (u8::MIN as isize); } -fn i8_to_u8(value: i8) -> Option { - if value >= 0 { - Some(value as u8) - } else { - None - } +pub fn i8_to_u8(value: i8) { + let _ = value >= 0; } fn main() {} diff --git a/tests/ui/checked_conversions.rs b/tests/ui/checked_conversions.rs index a643354e2438f..895a301e82126 100644 --- a/tests/ui/checked_conversions.rs +++ b/tests/ui/checked_conversions.rs @@ -1,106 +1,76 @@ // run-rustfix +#![allow( + clippy::cast_lossless, + // Int::max_value will be deprecated in the future + deprecated, +)] #![warn(clippy::checked_conversions)] -#![allow(clippy::cast_lossless)] -#![allow(dead_code)] + use std::convert::TryFrom; // Positive tests // Signed to unsigned -fn i64_to_u32(value: i64) -> Option { - if value <= (u32::max_value() as i64) && value >= 0 { - Some(value as u32) - } else { - None - } +pub fn i64_to_u32(value: i64) { + let _ = value <= (u32::max_value() as i64) && value >= 0; + let _ = value <= (u32::MAX as i64) && value >= 0; } -fn i64_to_u16(value: i64) -> Option { - if value <= i64::from(u16::max_value()) && value >= 0 { - Some(value as u16) - } else { - None - } +pub fn i64_to_u16(value: i64) { + let _ = value <= i64::from(u16::max_value()) && value >= 0; + let _ = value <= i64::from(u16::MAX) && value >= 0; } -fn isize_to_u8(value: isize) -> Option { - if value <= (u8::max_value() as isize) && value >= 0 { - Some(value as u8) - } else { - None - } +pub fn isize_to_u8(value: isize) { + let _ = value <= (u8::max_value() as isize) && value >= 0; + let _ = value <= (u8::MAX as isize) && value >= 0; } // Signed to signed -fn i64_to_i32(value: i64) -> Option { - if value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64) { - Some(value as i32) - } else { - None - } +pub fn i64_to_i32(value: i64) { + let _ = value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64); + let _ = value <= (i32::MAX as i64) && value >= (i32::MIN as i64); } -fn i64_to_i16(value: i64) -> Option { - if value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()) { - Some(value as i16) - } else { - None - } +pub fn i64_to_i16(value: i64) { + let _ = value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()); + let _ = value <= i64::from(i16::MAX) && value >= i64::from(i16::MIN); } // Unsigned to X -fn u32_to_i32(value: u32) -> Option { - if value <= i32::max_value() as u32 { - Some(value as i32) - } else { - None - } +pub fn u32_to_i32(value: u32) { + let _ = value <= i32::max_value() as u32; + let _ = value <= i32::MAX as u32; } -fn usize_to_isize(value: usize) -> isize { - if value <= isize::max_value() as usize && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn usize_to_isize(value: usize) { + let _ = value <= isize::max_value() as usize && value as i32 == 5; + let _ = value <= isize::MAX as usize && value as i32 == 5; } -fn u32_to_u16(value: u32) -> isize { - if value <= u16::max_value() as u32 && value as i32 == 5 { - 5 - } else { - 1 - } +pub fn u32_to_u16(value: u32) { + let _ = value <= u16::max_value() as u32 && value as i32 == 5; + let _ = value <= u16::MAX as u32 && value as i32 == 5; } // Negative tests -fn no_i64_to_i32(value: i64) -> Option { - if value <= (i32::max_value() as i64) && value >= 0 { - Some(value as i32) - } else { - None - } +pub fn no_i64_to_i32(value: i64) { + let _ = value <= (i32::max_value() as i64) && value >= 0; + let _ = value <= (i32::MAX as i64) && value >= 0; } -fn no_isize_to_u8(value: isize) -> Option { - if value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize) { - Some(value as u8) - } else { - None - } +pub fn no_isize_to_u8(value: isize) { + let _ = value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize); + let _ = value <= (u8::MAX as isize) && value >= (u8::MIN as isize); } -fn i8_to_u8(value: i8) -> Option { - if value >= 0 { - Some(value as u8) - } else { - None - } +pub fn i8_to_u8(value: i8) { + let _ = value >= 0; } fn main() {} diff --git a/tests/ui/checked_conversions.stderr b/tests/ui/checked_conversions.stderr index f678f009621f8..648ba3ccd01db 100644 --- a/tests/ui/checked_conversions.stderr +++ b/tests/ui/checked_conversions.stderr @@ -1,52 +1,100 @@ error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:13:8 + --> $DIR/checked_conversions.rs:17:13 | -LL | if value <= (u32::max_value() as i64) && value >= 0 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()` +LL | let _ = value <= (u32::max_value() as i64) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()` | = note: `-D clippy::checked-conversions` implied by `-D warnings` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:21:8 + --> $DIR/checked_conversions.rs:18:13 | -LL | if value <= i64::from(u16::max_value()) && value >= 0 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` +LL | let _ = value <= (u32::MAX as i64) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:29:8 + --> $DIR/checked_conversions.rs:22:13 | -LL | if value <= (u8::max_value() as isize) && value >= 0 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` +LL | let _ = value <= i64::from(u16::max_value()) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:39:8 + --> $DIR/checked_conversions.rs:23:13 | -LL | if value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64) { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` +LL | let _ = value <= i64::from(u16::MAX) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:47:8 + --> $DIR/checked_conversions.rs:27:13 | -LL | if value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()) { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` +LL | let _ = value <= (u8::max_value() as isize) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:57:8 + --> $DIR/checked_conversions.rs:28:13 | -LL | if value <= i32::max_value() as u32 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` +LL | let _ = value <= (u8::MAX as isize) && value >= 0; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:65:8 + --> $DIR/checked_conversions.rs:34:13 | -LL | if value <= isize::max_value() as usize && value as i32 == 5 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` +LL | let _ = value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` error: Checked cast can be simplified. - --> $DIR/checked_conversions.rs:73:8 + --> $DIR/checked_conversions.rs:35:13 | -LL | if value <= u16::max_value() as u32 && value as i32 == 5 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` +LL | let _ = value <= (i32::MAX as i64) && value >= (i32::MIN as i64); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` -error: aborting due to 8 previous errors +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:39:13 + | +LL | let _ = value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:40:13 + | +LL | let _ = value <= i64::from(i16::MAX) && value >= i64::from(i16::MIN); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:46:13 + | +LL | let _ = value <= i32::max_value() as u32; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:47:13 + | +LL | let _ = value <= i32::MAX as u32; + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:51:13 + | +LL | let _ = value <= isize::max_value() as usize && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:52:13 + | +LL | let _ = value <= isize::MAX as usize && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:56:13 + | +LL | let _ = value <= u16::max_value() as u32 && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` + +error: Checked cast can be simplified. + --> $DIR/checked_conversions.rs:57:13 + | +LL | let _ = value <= u16::MAX as u32 && value as i32 == 5; + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` + +error: aborting due to 16 previous errors diff --git a/tests/ui/checked_conversions.stdout b/tests/ui/checked_conversions.stdout deleted file mode 100644 index e69de29bb2d1d..0000000000000