33 lines
1 KiB
Rust
33 lines
1 KiB
Rust
// 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 crate::session::Session;
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use syntax::ast;
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use syntax::symbol::{Symbol, sym};
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use rustc_data_structures::sync::Once;
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pub fn update_limits(sess: &Session, krate: &ast::Crate) {
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update_limit(krate, &sess.recursion_limit, sym::recursion_limit, 64);
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update_limit(krate, &sess.type_length_limit, sym::type_length_limit, 1048576);
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}
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fn update_limit(krate: &ast::Crate, limit: &Once<usize>, name: Symbol, default: usize) {
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for attr in &krate.attrs {
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if !attr.check_name(name) {
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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) = s.as_str().parse().ok() {
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limit.set(n);
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return;
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}
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}
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}
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limit.set(default);
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}
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