From 36c4344ddf1866005c62910166ca077bf2e8f62e Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 26 Aug 2026 17:38:21 +0800
Subject: [CodeGen] Implement RISC-V finalize-isel

---
 backend/include/rcc/CodeGen/FinalizeISel.h         | 37 ++++++++++++++++++++++
 .../include/rcc/CodeGen/InstructionDescriptor.h    |  1 +
 2 files changed, 38 insertions(+)
 create mode 100644 backend/include/rcc/CodeGen/FinalizeISel.h

(limited to 'backend/include/rcc')

diff --git a/backend/include/rcc/CodeGen/FinalizeISel.h b/backend/include/rcc/CodeGen/FinalizeISel.h
new file mode 100644
index 0000000..c3121ec
--- /dev/null
+++ b/backend/include/rcc/CodeGen/FinalizeISel.h
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_FINALIZEISEL_H
+#define RCC_CODEGEN_FINALIZEISEL_H
+
+#include "rcc/CodeGen/MachinePassManager.h"
+
+namespace rcc {
+
+class MachineBasicBlock;
+class MachineInstr;
+
+class TargetFinalizeISelInfo {
+public:
+  virtual ~TargetFinalizeISelInfo() = default;
+
+  [[nodiscard]] virtual Expected<MachineBasicBlock *>
+  emitInstrWithCustomInserter(MachineInstr &Instruction, MachineBasicBlock &Block,
+                              MachineFunction &Function, const TargetDescription &Target) const = 0;
+};
+
+class FinalizeISelPass final : public MachineFunctionPass {
+public:
+  explicit FinalizeISelPass(const TargetFinalizeISelInfo &Info) noexcept : Info(&Info) {}
+
+  [[nodiscard]] const MachinePassContract &contract() const noexcept override;
+  [[nodiscard]] Expected<MachinePassResult> run(MachineFunction &Function,
+                                                const TargetDescription &Target,
+                                                MachineFunctionAnalysisManager &Analyses) override;
+
+private:
+  const TargetFinalizeISelInfo *Info;
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_FINALIZEISEL_H
diff --git a/backend/include/rcc/CodeGen/InstructionDescriptor.h b/backend/include/rcc/CodeGen/InstructionDescriptor.h
index b172cd9..ca127d4 100644
--- a/backend/include/rcc/CodeGen/InstructionDescriptor.h
+++ b/backend/include/rcc/CodeGen/InstructionDescriptor.h
@@ -147,6 +147,7 @@ enum class InstructionFlag : std::uint8_t {
   FakeUse,
   Generic,
   TerminalEmission,
+  UsesCustomInserter,
   Count,
 };
 
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