From a8a9d7d926202450645deae872d4d9dc11d63215 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sun, 2 Aug 2026 03:37:46 +0800
Subject: [CodeGen] Model machine debug metadata

Replace marker-based metadata operands with scoped references and inline DIExpression values. Add structured DILocation chains, instruction debug attachments, stack variable records, and entry values with unified verification, builder support, and deterministic cloning.
---
 backend/include/rcc/CodeGen/MachineInstr.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'backend/include/rcc/CodeGen/MachineInstr.h')

diff --git a/backend/include/rcc/CodeGen/MachineInstr.h b/backend/include/rcc/CodeGen/MachineInstr.h
index 78d48cb..69d7dd7 100644
--- a/backend/include/rcc/CodeGen/MachineInstr.h
+++ b/backend/include/rcc/CodeGen/MachineInstr.h
@@ -121,6 +121,16 @@ public:
     Location.reset();
   }
 
+  [[nodiscard]] const std::optional<MachineDebugLocation> &debugLocation() const noexcept {
+    return DebugLocation;
+  }
+
+  [[nodiscard]] Expected<void> setDebugLocation(MachineDebugLocation NewLocation);
+
+  void clearDebugLocation() noexcept {
+    DebugLocation.reset();
+  }
+
   [[nodiscard]] std::optional<OriginID> origin() const noexcept {
     return Origin;
   }
@@ -164,6 +174,7 @@ private:
   std::vector<const MachineMemOperand *> MemOperands;
   MachineInstrFlags Flags;
   std::optional<SourceLocation> Location;
+  std::optional<MachineDebugLocation> DebugLocation;
   std::optional<OriginID> Origin;
   std::uint32_t DebugInstrNumber = 0;
 
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