1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 // There are various parts of the compiler that must impose arbitrary limits
14 // on how deeply they recurse to prevent stack overflow. Users can override
15 // this via an attribute on the crate like `#![recursion_limit="22"]`. This pass
16 // just peeks and looks for that attribute.
21 use rustc_data_structures::sync::Once;
23 pub fn update_limits(sess: &Session, krate: &ast::Crate) {
24 update_limit(sess, krate, &sess.recursion_limit, "recursion_limit",
25 "recursion limit", 64);
26 update_limit(sess, krate, &sess.type_length_limit, "type_length_limit",
27 "type length limit", 1048576);
30 fn update_limit(sess: &Session, krate: &ast::Crate, limit: &Once<usize>,
31 name: &str, description: &str, default: usize) {
32 for attr in &krate.attrs {
33 if !attr.check_name(name) {
37 if let Some(s) = attr.value_str() {
38 if let Some(n) = s.as_str().parse().ok() {
44 span_err!(sess, attr.span, E0296,
45 "malformed {} attribute, expected #![{}=\"N\"]",