From d54646c69a5117cbeef35f5c3f0d546f4c6bf0e7 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 26 Aug 2026 00:50:21 +0800
Subject: [CodeGen] Implement reaching-def analysis printing

---
 backend/include/rcc/CodeGen/ReachingDefAnalysis.h | 52 +++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 backend/include/rcc/CodeGen/ReachingDefAnalysis.h

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

diff --git a/backend/include/rcc/CodeGen/ReachingDefAnalysis.h b/backend/include/rcc/CodeGen/ReachingDefAnalysis.h
new file mode 100644
index 0000000..64eb462
--- /dev/null
+++ b/backend/include/rcc/CodeGen/ReachingDefAnalysis.h
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_REACHINGDEFANALYSIS_H
+#define RCC_CODEGEN_REACHINGDEFANALYSIS_H
+
+#include "rcc/CodeGen/MachineFunctionAnalysisManager.h"
+#include "rcc/Support/Error.h"
+
+#include <cstddef>
+#include <span>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+
+namespace rcc {
+
+class MachineFunction;
+class MachineInstr;
+class MachineOperand;
+class TargetDescription;
+
+class ReachingDefAnalysis final {
+public:
+  using DefinitionSet = std::vector<const MachineInstr *>;
+
+  class Result final {
+  public:
+    [[nodiscard]] std::span<const MachineInstr *const>
+    reachingDefinitions(const MachineOperand &Operand) const noexcept;
+    [[nodiscard]] std::size_t instructionNumber(const MachineInstr &Instruction) const noexcept;
+    [[nodiscard]] bool invalidate(const MachineFunction &,
+                                  const PreservedAnalyses &Preserved) const noexcept;
+
+  private:
+    std::unordered_map<const MachineOperand *, DefinitionSet> OperandDefinitions;
+    std::unordered_map<const MachineInstr *, std::size_t> InstructionNumbers;
+
+    friend class ReachingDefAnalysis;
+  };
+
+  [[nodiscard]] static constexpr std::string_view name() noexcept {
+    return "ReachingDefAnalysis";
+  }
+
+  [[nodiscard]] static Expected<Result> run(MachineFunction &Function,
+                                            const TargetDescription &Target,
+                                            MachineFunctionAnalysisManager &Analyses);
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_REACHINGDEFANALYSIS_H
-- 
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