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// 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 rustc_data_structures::sync::Once;
pub fn update_limits(sess: &Session, krate: &ast::Crate) {
update_limit(sess, krate, &sess.recursion_limit, "recursion_limit",
"recursion limit", 64);
update_limit(sess, krate, &sess.type_length_limit, "type_length_limit",
"type length limit", 1048576);
}
fn update_limit(sess: &Session, krate: &ast::Crate, limit: &Once<usize>,
name: &str, description: &str, default: usize) {
for attr in &krate.attrs {
if !attr.check_name(name) {
continue;
}
if let Some(s) = attr.value_str() {
if let Some(n) = s.as_str().parse().ok() {
limit.set(n);
return;
}
}
span_err!(sess, attr.span, E0296,
"malformed {} attribute, expected #![{}=\"N\"]",
description, name);
}
limit.set(default);
}
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