From 71d7e561bdc2e58cef7fedcec1970dafc852bb61 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Tue, 3 Jan 2023 08:56:00 -0500
Subject: [PATCH] Comment

---
 Readme.md      | 10 ++++++++++
 src/builder.rs |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/Readme.md b/Readme.md
index a74750228ba0..e9c719d84722 100644
--- a/Readme.md
+++ b/Readme.md
@@ -172,6 +172,16 @@ debug_gimple_stmt(gimple_struct)
 
 To get the `rustc` command to run in `gdb`, add the `--verbose` flag to `cargo build`.
 
+To have the correct file paths in `gdb` instead of `/usr/src/debug/gcc/libstdc++-v3/libsupc++/eh_personality.cc`, TODO
+
+Maybe by calling the following at the beginning of gdb:
+
+```
+set substitute-path /usr/src/debug/gcc /home/bouanto/Ordinateur/Programmation/Projets/gcc-repo/gcc
+```
+
+TODO: but that's not what I remember I was doing.
+
 ### How to use a custom-build rustc
 
  * Build the stage2 compiler (`rustup toolchain link debug-current build/x86_64-unknown-linux-gnu/stage2`).
diff --git a/src/builder.rs b/src/builder.rs
index 082b7be8c4e3..fd674ed0b871 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -1210,6 +1210,14 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
     fn cleanup_landing_pad(&mut self, _ty: Type<'gcc>, pers_fn: RValue<'gcc>) -> RValue<'gcc> {
         self.set_personality_fn(pers_fn);
 
+        /*
+         * Matching GCC exception handling with LLVM:
+         *
+         *    GCC                 LLVM
+         *    CATCH_EXPR          landing pad catch clause
+         *    TRY_FINALLY_EXPR    cleanup
+         */
+
         self.cleanup_blocks.borrow_mut().insert(self.block);
 
         // FIXME: we're probably not creating a real cleanup pad here.