2018-01-09 22:42:07 -06:00
|
|
|
use rustc::lint::*;
|
|
|
|
use rustc::hir;
|
|
|
|
use rustc::hir::def::Def;
|
|
|
|
use utils::{match_def_path, span_lint_and_sugg};
|
|
|
|
|
|
|
|
/// **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);
|
|
|
|
/// ```
|
2018-03-28 08:24:26 -05:00
|
|
|
declare_clippy_lint! {
|
2018-01-09 22:42:07 -06:00
|
|
|
pub REPLACE_CONSTS,
|
2018-03-28 08:24:26 -05:00
|
|
|
pedantic,
|
2018-01-09 22:42:07 -06:00
|
|
|
"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::ExprPath(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(),
|
|
|
|
);
|
|
|
|
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()"),
|
|
|
|
];
|