83 lines
3.0 KiB
Rust
83 lines
3.0 KiB
Rust
use crate::consts::{constant, Constant};
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use crate::rustc::hir::{Expr, ExprKind};
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use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
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use crate::rustc::{declare_tool_lint, lint_array};
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use crate::syntax::ast::LitKind;
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use crate::utils::{is_direct_expn_of, span_help_and_lint};
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use if_chain::if_chain;
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/// **What it does:** Check to call assert!(true/false)
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///
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/// **Why is this bad?** Will be optimized out by the compiler or should probably be replaced by a
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/// panic!() or unreachable!()
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///
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/// **Known problems:** None
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///
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/// **Example:**
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/// ```rust
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/// assert!(false)
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/// // or
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/// assert!(true)
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/// // or
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/// const B: bool = false;
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/// assert!(B)
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/// ```
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declare_clippy_lint! {
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pub ASSERTIONS_ON_CONSTANTS,
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style,
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"assert!(true/false) will be optimized out by the compiler/should probably be replaced by a panic!() or unreachable!()"
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}
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pub struct AssertionsOnConstants;
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impl LintPass for AssertionsOnConstants {
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fn get_lints(&self) -> LintArray {
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lint_array![ASSERTIONS_ON_CONSTANTS]
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}
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fn name(&self) -> &'static str {
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"AssertionsOnConstants"
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}
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}
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impl<'a, 'tcx> LateLintPass<'a, 'tcx> for AssertionsOnConstants {
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fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
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if_chain! {
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if is_direct_expn_of(e.span, "assert").is_some();
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if let ExprKind::Unary(_, ref lit) = e.node;
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then {
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if let ExprKind::Lit(ref inner) = lit.node {
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match inner.node {
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LitKind::Bool(true) => {
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span_help_and_lint(cx, ASSERTIONS_ON_CONSTANTS, e.span,
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"assert!(true) will be optimized out by the compiler",
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"remove it");
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},
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LitKind::Bool(false) => {
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span_help_and_lint(
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cx, ASSERTIONS_ON_CONSTANTS, e.span,
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"assert!(false) should probably be replaced",
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"use panic!() or unreachable!()");
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},
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_ => (),
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}
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} else if let Some(bool_const) = constant(cx, cx.tables, lit) {
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match bool_const.0 {
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Constant::Bool(true) => {
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span_help_and_lint(cx, ASSERTIONS_ON_CONSTANTS, e.span,
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"assert!(const: true) will be optimized out by the compiler",
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"remove it");
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},
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Constant::Bool(false) => {
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span_help_and_lint(cx, ASSERTIONS_ON_CONSTANTS, e.span,
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"assert!(const: false) should probably be replaced",
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"use panic!() or unreachable!()");
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},
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_ => (),
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}
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}
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}
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}
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}
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}
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