From d47834ee1b8fce7956272e27c9403021940fec8e Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 14 Jul 2020 18:31:48 +0200
Subject: Guard against infinite macro expansions

closes #4463
---
 crates/ra_hir_def/src/nameres/collector.rs | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'crates/ra_hir_def/src/nameres/collector.rs')

diff --git a/crates/ra_hir_def/src/nameres/collector.rs b/crates/ra_hir_def/src/nameres/collector.rs
index a35ac1024..e55cc1e55 100644
--- a/crates/ra_hir_def/src/nameres/collector.rs
+++ b/crates/ra_hir_def/src/nameres/collector.rs
@@ -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();
-- 
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