mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-22 19:13:29 +00:00
3f62fc3a7e
This is somewhat misleading, as those are actually external crates, and don't need a crate:: prefix.
118 lines
4.5 KiB
Rust
118 lines
4.5 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
use crate::utils::{match_def_path, span_lint_and_sugg};
|
|
use if_chain::if_chain;
|
|
use rustc::hir;
|
|
use rustc::hir::def::Def;
|
|
use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
|
|
use rustc::{declare_tool_lint, lint_array};
|
|
use rustc_errors::Applicability;
|
|
|
|
/// **What it does:** Checks for usage of `ATOMIC_X_INIT`, `ONCE_INIT`, and
|
|
/// `uX/iX::MIN/MAX`.
|
|
///
|
|
/// **Why is this bad?** `const fn`s exist
|
|
///
|
|
/// **Known problems:** None.
|
|
///
|
|
/// **Example:**
|
|
/// ```rust
|
|
/// static FOO: AtomicIsize = ATOMIC_ISIZE_INIT;
|
|
/// ```
|
|
///
|
|
/// Could be written:
|
|
///
|
|
/// ```rust
|
|
/// static FOO: AtomicIsize = AtomicIsize::new(0);
|
|
/// ```
|
|
declare_clippy_lint! {
|
|
pub REPLACE_CONSTS,
|
|
pedantic,
|
|
"Lint usages of standard library `const`s that could be replaced by `const fn`s"
|
|
}
|
|
|
|
pub struct ReplaceConsts;
|
|
|
|
impl LintPass for ReplaceConsts {
|
|
fn get_lints(&self) -> LintArray {
|
|
lint_array!(REPLACE_CONSTS)
|
|
}
|
|
}
|
|
|
|
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ReplaceConsts {
|
|
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr) {
|
|
if_chain! {
|
|
if let hir::ExprKind::Path(ref qp) = expr.node;
|
|
if let Def::Const(def_id) = cx.tables.qpath_def(qp, expr.hir_id);
|
|
then {
|
|
for &(const_path, repl_snip) in REPLACEMENTS {
|
|
if match_def_path(cx.tcx, def_id, const_path) {
|
|
span_lint_and_sugg(
|
|
cx,
|
|
REPLACE_CONSTS,
|
|
expr.span,
|
|
&format!("using `{}`", const_path.last().expect("empty path")),
|
|
"try this",
|
|
repl_snip.to_string(),
|
|
Applicability::MachineApplicable,
|
|
);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
const REPLACEMENTS: &[(&[&str], &str)] = &[
|
|
// Once
|
|
(&["core", "sync", "ONCE_INIT"], "Once::new()"),
|
|
// Atomic
|
|
(
|
|
&["core", "sync", "atomic", "ATOMIC_BOOL_INIT"],
|
|
"AtomicBool::new(false)",
|
|
),
|
|
(&["core", "sync", "atomic", "ATOMIC_ISIZE_INIT"], "AtomicIsize::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_I8_INIT"], "AtomicI8::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_I16_INIT"], "AtomicI16::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_I32_INIT"], "AtomicI32::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_I64_INIT"], "AtomicI64::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_USIZE_INIT"], "AtomicUsize::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_U8_INIT"], "AtomicU8::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_U16_INIT"], "AtomicU16::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_U32_INIT"], "AtomicU32::new(0)"),
|
|
(&["core", "sync", "atomic", "ATOMIC_U64_INIT"], "AtomicU64::new(0)"),
|
|
// Min
|
|
(&["core", "isize", "MIN"], "isize::min_value()"),
|
|
(&["core", "i8", "MIN"], "i8::min_value()"),
|
|
(&["core", "i16", "MIN"], "i16::min_value()"),
|
|
(&["core", "i32", "MIN"], "i32::min_value()"),
|
|
(&["core", "i64", "MIN"], "i64::min_value()"),
|
|
(&["core", "i128", "MIN"], "i128::min_value()"),
|
|
(&["core", "usize", "MIN"], "usize::min_value()"),
|
|
(&["core", "u8", "MIN"], "u8::min_value()"),
|
|
(&["core", "u16", "MIN"], "u16::min_value()"),
|
|
(&["core", "u32", "MIN"], "u32::min_value()"),
|
|
(&["core", "u64", "MIN"], "u64::min_value()"),
|
|
(&["core", "u128", "MIN"], "u128::min_value()"),
|
|
// Max
|
|
(&["core", "isize", "MAX"], "isize::max_value()"),
|
|
(&["core", "i8", "MAX"], "i8::max_value()"),
|
|
(&["core", "i16", "MAX"], "i16::max_value()"),
|
|
(&["core", "i32", "MAX"], "i32::max_value()"),
|
|
(&["core", "i64", "MAX"], "i64::max_value()"),
|
|
(&["core", "i128", "MAX"], "i128::max_value()"),
|
|
(&["core", "usize", "MAX"], "usize::max_value()"),
|
|
(&["core", "u8", "MAX"], "u8::max_value()"),
|
|
(&["core", "u16", "MAX"], "u16::max_value()"),
|
|
(&["core", "u32", "MAX"], "u32::max_value()"),
|
|
(&["core", "u64", "MAX"], "u64::max_value()"),
|
|
(&["core", "u128", "MAX"], "u128::max_value()"),
|
|
];
|