From 379ff50dcc7ccf977379aee68fa9d10f69065d23 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sun, 9 Aug 2026 18:31:49 +0800
Subject: [MC] Implement RV64GC assembly emission

---
 .../rcc/Target/RISCV/RISCVAssemblyPrinter.h        | 35 ++++++++++++
 .../include/rcc/Target/RISCV/RISCVInstPrinter.h    | 36 +++++++++++++
 .../rcc/Target/RISCV/RISCVMCTargetLowering.h       | 62 ++++++++++++++++++++++
 3 files changed, 133 insertions(+)
 create mode 100644 backend/include/rcc/Target/RISCV/RISCVAssemblyPrinter.h
 create mode 100644 backend/include/rcc/Target/RISCV/RISCVInstPrinter.h
 create mode 100644 backend/include/rcc/Target/RISCV/RISCVMCTargetLowering.h

(limited to 'backend/include/rcc/Target')

diff --git a/backend/include/rcc/Target/RISCV/RISCVAssemblyPrinter.h b/backend/include/rcc/Target/RISCV/RISCVAssemblyPrinter.h
new file mode 100644
index 0000000..5c8dca5
--- /dev/null
+++ b/backend/include/rcc/Target/RISCV/RISCVAssemblyPrinter.h
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_TARGET_RISCV_RISCVASSEMBLYPRINTER_H
+#define RCC_TARGET_RISCV_RISCVASSEMBLYPRINTER_H
+
+#include "rcc/CodeGen/AsmPrinter.h"
+#include "rcc/CodeGen/TargetDescription.h"
+#include "rcc/Support/Error.h"
+
+#include <string>
+
+namespace rcc {
+class CompilationUnit;
+class MachineFunction;
+} // namespace rcc
+
+namespace rcc::riscv {
+
+struct AssemblyEmissionOptions final {
+  bool EmitFunctionDirectives = true;
+  bool EmitCFI = true;
+  bool EmitBlockLabels = true;
+  bool VerifyInput = true;
+};
+
+[[nodiscard]] Expected<std::string> emitAssembly(const CompilationUnit &Unit,
+                                                 const TargetDescription &Target,
+                                                 AssemblyEmissionOptions Options = {});
+[[nodiscard]] Expected<std::string> emitAssembly(const MachineFunction &Function,
+                                                 const TargetDescription &Target,
+                                                 AssemblyEmissionOptions Options = {});
+
+} // namespace rcc::riscv
+
+#endif // RCC_TARGET_RISCV_RISCVASSEMBLYPRINTER_H
diff --git a/backend/include/rcc/Target/RISCV/RISCVInstPrinter.h b/backend/include/rcc/Target/RISCV/RISCVInstPrinter.h
new file mode 100644
index 0000000..564ca2f
--- /dev/null
+++ b/backend/include/rcc/Target/RISCV/RISCVInstPrinter.h
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_TARGET_RISCV_RISCVINSTPRINTER_H
+#define RCC_TARGET_RISCV_RISCVINSTPRINTER_H
+
+#include "rcc/CodeGen/TargetDescription.h"
+#include "rcc/MC/MCInstPrinter.h"
+
+#include <cstdint>
+#include <string>
+#include <string_view>
+
+namespace rcc::riscv {
+
+enum class RISCVMCExprKind : std::uint32_t {
+  CallPLT = 1,
+  PCRelativeHigh = 2,
+  PCRelativeLow = 3,
+};
+
+class RISCVInstPrinter final : public mc::MCInstPrinter {
+public:
+  explicit RISCVInstPrinter(const TargetDescription &Target) noexcept : Target(&Target) {}
+
+  [[nodiscard]] Expected<std::string>
+  printInstruction(const mc::MCInst &Instruction) const override;
+  [[nodiscard]] Expected<std::string>
+  printTargetExpression(std::uint32_t Kind, std::string_view Operand) const override;
+
+private:
+  const TargetDescription *Target;
+};
+
+} // namespace rcc::riscv
+
+#endif // RCC_TARGET_RISCV_RISCVINSTPRINTER_H
diff --git a/backend/include/rcc/Target/RISCV/RISCVMCTargetLowering.h b/backend/include/rcc/Target/RISCV/RISCVMCTargetLowering.h
new file mode 100644
index 0000000..fd620ad
--- /dev/null
+++ b/backend/include/rcc/Target/RISCV/RISCVMCTargetLowering.h
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_TARGET_RISCV_RISCVMCTARGETLOWERING_H
+#define RCC_TARGET_RISCV_RISCVMCTARGETLOWERING_H
+
+#include "rcc/CodeGen/TargetMCInstLowering.h"
+#include "rcc/Target/RISCV/RISCVInstPrinter.h"
+
+namespace rcc::riscv {
+
+class RISCVMCTargetLowering final : public TargetMCInstLowering {
+public:
+  explicit RISCVMCTargetLowering(const TargetDescription &Target) noexcept
+      : Target(&Target), Printer(Target) {}
+
+  [[nodiscard]] const mc::MCInstPrinter &instructionPrinter() const noexcept override {
+    return Printer;
+  }
+
+  [[nodiscard]] Expected<mc::MCInst> lowerInstruction(const MachineInstr &Instruction,
+                                                      MachineMCContext &Context) const override;
+  [[nodiscard]] Expected<void> emitTerminalInstruction(const MachineInstr &Instruction,
+                                                       MachineMCContext &Context,
+                                                       mc::MCStreamer &Streamer) const override;
+
+  [[nodiscard]] Expected<mc::MCSectionDesc>
+  textSection(const MachineFunction &Function) const override;
+  [[nodiscard]] Expected<mc::MCSectionDesc> globalSection(const GlobalObjectDesc &Object,
+                                                          MachineMCContext &Context) const override;
+  [[nodiscard]] Expected<mc::MCSectionDesc>
+  constantPoolSection(const MachineFunction &Function,
+                      const MachineConstantPoolEntry &Entry) const override;
+  [[nodiscard]] Expected<mc::MCSectionDesc>
+  jumpTableSection(const MachineFunction &Function,
+                   const MachineJumpTableEntry &Entry) const override;
+
+  [[nodiscard]] Expected<void> emitFileHeader(MachineMCContext &Context,
+                                              mc::MCStreamer &Streamer) const override;
+  [[nodiscard]] Expected<void> emitFileTrailer(MachineMCContext &Context,
+                                               mc::MCStreamer &Streamer) const override;
+  [[nodiscard]] Expected<void> emitGenericConstant(const GenericConstantData &Constant,
+                                                   std::uint64_t Size, MachineMCContext &Context,
+                                                   mc::MCStreamer &Streamer) const override;
+  [[nodiscard]] Expected<void> emitGlobalInitializer(const GlobalInitializer &Initializer,
+                                                     MachineMCContext &Context,
+                                                     mc::MCStreamer &Streamer) const override;
+  [[nodiscard]] Expected<void> emitTargetConstant(const TargetConstant &Constant,
+                                                  MachineMCContext &Context,
+                                                  mc::MCStreamer &Streamer) const override;
+  [[nodiscard]] Expected<void> emitTargetJumpTable(const MachineFunction &Function,
+                                                   const MachineJumpTableEntry &Entry,
+                                                   MachineMCContext &Context,
+                                                   mc::MCStreamer &Streamer) const override;
+
+private:
+  const TargetDescription *Target;
+  RISCVInstPrinter Printer;
+};
+
+} // namespace rcc::riscv
+
+#endif // RCC_TARGET_RISCV_RISCVMCTARGETLOWERING_H
-- 
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