| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // Recursion limit. |
| // |
| // There are various parts of the compiler that must impose arbitrary limits |
| // on how deeply they recurse to prevent stack overflow. Users can override |
| // this via an attribute on the crate like `#![recursion_limit="22"]`. This pass |
| // just peeks and looks for that attribute. |
| |
| use session::Session; |
| use syntax::ast; |
| use syntax::attr::AttrMetaMethods; |
| |
| pub fn update_recursion_limit(sess: &Session, krate: &ast::Crate) { |
| for attr in &krate.attrs { |
| if !attr.check_name("recursion_limit") { |
| continue; |
| } |
| |
| if let Some(s) = attr.value_str() { |
| if let Some(n) = s.parse().ok() { |
| sess.recursion_limit.set(n); |
| return; |
| } |
| } |
| |
| span_err!(sess, attr.span, E0296, "malformed recursion limit attribute, \ |
| expected #![recursion_limit=\"N\"]"); |
| } |
| } |
