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use rustc::lint::*;
use rustc::hir::{Expr, ExprCall, ExprPath};
use utils::{match_def_path, paths, span_lint};
declare_lint! {
pub MEM_FORGET,
Allow,
"`mem::forget` usage on `Drop` types, likely to cause memory leaks"
}
pub struct MemForget;
impl LintPass for MemForget {
fn get_lints(&self) -> LintArray {
lint_array![MEM_FORGET]
}
}
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MemForget {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
if let ExprCall(ref path_expr, ref args) = e.node {
if let ExprPath(ref qpath) = path_expr.node {
let def_id = cx.tables.qpath_def(qpath, path_expr.id).def_id();
if match_def_path(cx.tcx, def_id, &paths::MEM_FORGET) {
let forgot_ty = cx.tables.expr_ty(&args[0]);
if match forgot_ty.ty_adt_def() {
Some(def) => def.has_dtor(cx.tcx),
_ => false,
} {
span_lint(cx, MEM_FORGET, e.span, "usage of mem::forget on Drop type");
}
}
}
}
}
}