rust/compiler/rustc_lint
bors 8ecaad85f6 Auto merge of #105919 - uweigand:s390x-stack-overflow, r=Nilstrieb
Fix stack overflow in recursive AST walk in early lint

The src/test/ui/issues/issue-74564-if-expr-stack-overflow.rs test case added to verify https://github.com/rust-lang/rust/issues/74564 still crashes with a stack overflow on s390x-ibm-linux.

Symptom is a very deep recursion in compiler/rustc_lint/src/early.rs:
    fn visit_expr(&mut self, e: &'a ast::Expr) {
        self.with_lint_attrs(e.id, &e.attrs, |cx| {
            lint_callback!(cx, check_expr, e);
            ast_visit::walk_expr(cx, e);
        })
    }
(where walk_expr recursively calls back into visit_expr).  The crash happens at a nesting depth of over 17000 stack frames when using the default 8 MB stack size on s390x.

This patch fixes the problem by adding a ensure_sufficient_stack call to the with_lint_attrs routine (which also should take care of all the other mutually recursive visitors here).

Fixes part of https://github.com/rust-lang/rust/issues/105383.
2023-01-11 08:50:38 +00:00
..
src Auto merge of #105919 - uweigand:s390x-stack-overflow, r=Nilstrieb 2023-01-11 08:50:38 +00:00
Cargo.toml Update unicode-rs crates to Unicode 15 2022-09-17 01:55:56 +08:00