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Guard against infinite macro expansions

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closes #4463
This commit is contained in:
Aleksey Kladov 2020-07-14 18:31:48 +02:00
parent ff6cf4f849
commit d47834ee1b
2 changed files with 29 additions and 0 deletions
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5
crates/ra_hir_def/src/nameres/collector.rs
View file

@ -717,6 +717,11 @@ impl DefCollector<'_> {
macro_call_id: MacroCallId,
depth: usize,
) {
if depth > 100 {
mark::hit!(macro_expansion_overflow);
log::warn!("macro expansion is too deep");
return;
}
let file_id: HirFileId = macro_call_id.as_file();
let item_tree = self.db.item_tree(file_id);
let mod_dir = self.mod_dirs[&module_id].clone();

24
crates/ra_hir_def/src/nameres/tests/macros.rs
View file

@ -660,3 +660,27 @@ fn expand_multiple_derive() {
);
assert_eq!(map.modules[map.root].scope.impls().len(), 2);
}
#[test]
fn macro_expansion_overflow() {
mark::check!(macro_expansion_overflow);
compute_crate_def_map(
"
macro_rules! a {
($e:expr; $($t:tt)*) => {
b!($($t)*);
};
() => {};
}
macro_rules! b {
(static = $e:expr; $($t:tt)*) => {
a!($e; $($t)*);
};
() => {};
}
b! { static = #[] (); }
",
);
}