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