From 3d2e268154e5a93019274fb1988855a77db1f841 Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Mon, 26 Jan 2026 11:59:39 +0100
Subject: [PATCH] kernel: add SwitchRule signal_src

(cherry picked from commit 53585db9f735ecdcf0dc10132eada67a85245d64)
---
 frontends/ast/genrtlil.cc | 1 +
 kernel/rtlil.h            | 1 +
 2 files changed, 2 insertions(+)

diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc
index 660b07ec6..72de09b66 100644
--- a/frontends/ast/genrtlil.cc
+++ b/frontends/ast/genrtlil.cc
@@ -704,6 +704,7 @@ struct AST_INTERNAL::ProcessGenerator
 				sw->module = current_module;
 				set_src_attr(sw, ast);
 				sw->signal = ast->children[0]->genWidthRTLIL(width_hint, sign_hint, &subst_rvalue_map.stdmap());
+				sw->signal_src = current_module->design->twines.add(Twine{ast->children[0]->loc_string()});
 				current_case->switches.push_back(sw);
 
 				for (auto &attr : ast->attributes) {
diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index 3d7cc730e..d30b71bc3 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -2563,6 +2563,7 @@ struct RTLIL::SwitchRule : public RTLIL::AttrObject
 	RTLIL::Module *module = nullptr;
 
 	RTLIL::SigSpec signal;
+	TwineRef signal_src = Twine::Null;
 	std::vector<RTLIL::CaseRule*> cases;
 
 	~SwitchRule();