1 use crate::utils::{is_entrypoint_fn, match_def_path, paths, qpath_res, span_lint};
2 use if_chain::if_chain;
3 use rustc::declare_lint_pass;
4 use rustc::hir::{Expr, ExprKind, Item, ItemKind, Node};
5 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
6 use rustc_session::declare_tool_lint;
9 /// **What it does:** `exit()` terminates the program and doesn't provide a
12 /// **Why is this bad?** Ideally a program is terminated by finishing
13 /// the main function.
15 /// **Known problems:** None.
19 /// std::process::exit(0)
23 "`std::process::exit` is called, terminating the program"
26 declare_lint_pass!(Exit => [EXIT]);
28 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Exit {
29 fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
31 if let ExprKind::Call(ref path_expr, ref _args) = e.kind;
32 if let ExprKind::Path(ref path) = path_expr.kind;
33 if let Some(def_id) = qpath_res(cx, path, path_expr.hir_id).opt_def_id();
34 if match_def_path(cx, def_id, &paths::EXIT);
36 let parent = cx.tcx.hir().get_parent_item(e.hir_id);
37 if let Some(Node::Item(Item{kind: ItemKind::Fn(..), ..})) = cx.tcx.hir().find(parent) {
38 // If the next item up is a function we check if it is an entry point
39 // and only then emit a linter warning
40 let def_id = cx.tcx.hir().local_def_id(parent);
41 if !is_entrypoint_fn(cx, def_id) {
42 span_lint(cx, EXIT, e.span, "usage of `process::exit`");