-use crate::utils::{is_direct_expn_of, is_expn_of, paths, resolve_node, span_lint, match_def_path};
-use crate::utils::sym;
+use crate::utils::{is_expn_of, match_panic_call, span_lint};
use if_chain::if_chain;
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_lint_pass, declare_tool_lint};
-use syntax::ast::LitKind;
-use syntax::ptr::P;
-use syntax_pos::Span;
+use rustc_hir::Expr;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::Span;
declare_clippy_lint! {
- /// **What it does:** Checks for missing parameters in `panic!`.
+ /// **What it does:** Checks for usage of `panic!`.
///
- /// **Why is this bad?** Contrary to the `format!` family of macros, there are
- /// two forms of `panic!`: if there are no parameters given, the first argument
- /// is not a format string and used literally. So while `format!("{}")` will
- /// fail to compile, `panic!("{}")` will not.
+ /// **Why is this bad?** `panic!` will stop the execution of the executable
///
/// **Known problems:** None.
///
/// **Example:**
/// ```no_run
- /// panic!("This `panic!` is probably missing a parameter there: {}");
+ /// panic!("even with a good reason");
/// ```
- pub PANIC_PARAMS,
- style,
- "missing parameters in `panic!` calls"
+ pub PANIC,
+ restriction,
+ "usage of the `panic!` macro"
}
declare_clippy_lint! {
"`unimplemented!` should not be present in production code"
}
-declare_lint_pass!(PanicUnimplemented => [PANIC_PARAMS, UNIMPLEMENTED]);
+declare_clippy_lint! {
+ /// **What it does:** Checks for usage of `todo!`.
+ ///
+ /// **Why is this bad?** This macro should not be present in production code
+ ///
+ /// **Known problems:** None.
+ ///
+ /// **Example:**
+ /// ```no_run
+ /// todo!();
+ /// ```
+ pub TODO,
+ restriction,
+ "`todo!` should not be present in production code"
+}
+
+declare_clippy_lint! {
+ /// **What it does:** Checks for usage of `unreachable!`.
+ ///
+ /// **Why is this bad?** This macro can cause code to panic
+ ///
+ /// **Known problems:** None.
+ ///
+ /// **Example:**
+ /// ```no_run
+ /// unreachable!();
+ /// ```
+ pub UNREACHABLE,
+ restriction,
+ "usage of the `unreachable!` macro"
+}
+
+declare_lint_pass!(PanicUnimplemented => [UNIMPLEMENTED, UNREACHABLE, TODO, PANIC]);
-impl<'a, 'tcx> LateLintPass<'a, 'tcx> for PanicUnimplemented {
- fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
- if_chain! {
- if let ExprKind::Block(ref block, _) = expr.node;
- if let Some(ref ex) = block.expr;
- if let ExprKind::Call(ref fun, ref params) = ex.node;
- if let ExprKind::Path(ref qpath) = fun.node;
- if let Some(fun_def_id) = resolve_node(cx, qpath, fun.hir_id).opt_def_id();
- if match_def_path(cx, fun_def_id, &*paths::BEGIN_PANIC);
- if params.len() == 2;
- then {
- if is_expn_of(expr.span, *sym::unimplemented).is_some() {
- let span = get_outer_span(expr);
- span_lint(cx, UNIMPLEMENTED, span,
- "`unimplemented` should not be present in production code");
- } else {
- match_panic(params, expr, cx);
- }
+impl<'tcx> LateLintPass<'tcx> for PanicUnimplemented {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if match_panic_call(cx, expr).is_some() {
+ let span = get_outer_span(expr);
+ if is_expn_of(expr.span, "unimplemented").is_some() {
+ span_lint(
+ cx,
+ UNIMPLEMENTED,
+ span,
+ "`unimplemented` should not be present in production code",
+ );
+ } else if is_expn_of(expr.span, "todo").is_some() {
+ span_lint(cx, TODO, span, "`todo` should not be present in production code");
+ } else if is_expn_of(expr.span, "unreachable").is_some() {
+ span_lint(cx, UNREACHABLE, span, "usage of the `unreachable!` macro");
+ } else if is_expn_of(expr.span, "panic").is_some() {
+ span_lint(cx, PANIC, span, "`panic` should not be present in production code");
}
}
}
}
-fn get_outer_span(expr: &Expr) -> Span {
+fn get_outer_span(expr: &Expr<'_>) -> Span {
if_chain! {
- if let Some(first) = expr.span.ctxt().outer().expn_info();
- if let Some(second) = first.call_site.ctxt().outer().expn_info();
+ if expr.span.from_expansion();
+ let first = expr.span.ctxt().outer_expn_data();
+ if first.call_site.from_expansion();
+ let second = first.call_site.ctxt().outer_expn_data();
then {
second.call_site
} else {
}
}
}
-
-fn match_panic(params: &P<[Expr]>, expr: &Expr, cx: &LateContext<'_, '_>) {
- if_chain! {
- if let ExprKind::Lit(ref lit) = params[0].node;
- if is_direct_expn_of(expr.span, *sym::panic).is_some();
- if let LitKind::Str(ref string, _) = lit.node;
- let string = string.as_str().replace("{{", "").replace("}}", "");
- if let Some(par) = string.find('{');
- if string[par..].contains('}');
- if params[0].span.source_callee().is_none();
- if params[0].span.lo() != params[0].span.hi();
- then {
- span_lint(cx, PANIC_PARAMS, params[0].span,
- "you probably are missing some parameter in your format string");
- }
- }
-}