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use clippy_utils::diagnostics::span_lint;
use clippy_utils::{is_entrypoint_fn, match_def_path, paths};
use if_chain::if_chain;
use rustc_hir::{Expr, ExprKind, Item, ItemKind, Node};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
declare_clippy_lint! {
/// ### What it does
/// Detects calls to the `exit()` function which terminates the program.
///
/// ### Why is this bad?
/// Exit terminates the program at the location it is called. For unrecoverable
/// errors `panics` should be used to provide a stacktrace and potentualy other
/// information. A normal termination or one with an error code should happen in
/// the main function.
///
/// ### Example
/// ```
/// std::process::exit(0)
/// ```
///
/// Use instead:
///
/// ```ignore
/// // To provide a stacktrace and additional information
/// panic!("message");
///
/// // or a main method with a return
/// fn main() -> Result<(), i32> {
/// Ok(())
/// }
/// ```
#[clippy::version = "1.41.0"]
pub EXIT,
restriction,
"detects `std::process::exit` calls"
}
declare_lint_pass!(Exit => [EXIT]);
impl<'tcx> LateLintPass<'tcx> for Exit {
fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
if_chain! {
if let ExprKind::Call(path_expr, _args) = e.kind;
if let ExprKind::Path(ref path) = path_expr.kind;
if let Some(def_id) = cx.qpath_res(path, path_expr.hir_id).opt_def_id();
if match_def_path(cx, def_id, &paths::EXIT);
let parent = cx.tcx.hir().get_parent_item(e.hir_id).def_id;
if let Some(Node::Item(Item{kind: ItemKind::Fn(..), ..})) = cx.tcx.hir().find_by_def_id(parent);
// If the next item up is a function we check if it is an entry point
// and only then emit a linter warning
if !is_entrypoint_fn(cx, parent.to_def_id());
then {
span_lint(cx, EXIT, e.span, "usage of `process::exit`");
}
}
}
}
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