From 263c426bfd2d8119ad9f615fc0616cf01984435a Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Thu, 25 Aug 2022 17:55:21 +1000
Subject: [PATCH] Add size assertions for `FnAbi` and `ArgAbi`.

---
 compiler/rustc_target/src/abi/call/mod.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/compiler/rustc_target/src/abi/call/mod.rs b/compiler/rustc_target/src/abi/call/mod.rs
index 639ce64a9f5..ab53ea6101d 100644
--- a/compiler/rustc_target/src/abi/call/mod.rs
+++ b/compiler/rustc_target/src/abi/call/mod.rs
@@ -730,3 +730,13 @@ impl<'a, Ty> FnAbi<'a, Ty> {
         Ok(())
     }
 }
+
+// Some types are used a lot. Make sure they don't unintentionally get bigger.
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+mod size_asserts {
+    use super::*;
+    use rustc_data_structures::static_assert_size;
+    // These are in alphabetical order, which is easy to maintain.
+    static_assert_size!(ArgAbi<'_, usize>, 208);
+    static_assert_size!(FnAbi<'_, usize>, 248);
+}