1 files changed, 156 insertions, 0 deletions
diff --git a/backend/include/rcc/Target/RISCV/RISCVSubtarget.h b/backend/include/rcc/Target/RISCV/RISCVSubtarget.h
new file mode 100644
index 0000000..a5ba01a
--- /dev/null
+++ b/backend/include/rcc/Target/RISCV/RISCVSubtarget.h
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_TARGET_RISCV_RISCVSUBTARGET_H
+#define RCC_TARGET_RISCV_RISCVSUBTARGET_H
+
+#include "rcc/CodeGen/CommandFlags.h"
+#include "rcc/Support/Error.h"
+
+#include <cstdint>
+#include <memory>
+#include <span>
+#include <string>
+#include <string_view>
+
+namespace rcc {
+
+class InstructionSelector;
+class LegalizerInfo;
+class TargetCallLowering;
+class TargetFrameLowering;
+class TargetSchedulingHooks;
+class TargetSchedulingModel;
+
+namespace riscv {
+
+class RISCVRegisterBankInfo;
+
+enum class RISCVExtension : std::uint8_t {
+  I,
+  M,
+  A,
+  F,
+  D,
+  C,
+  Zba,
+  Zbb,
+  Zicsr,
+  Zifencei,
+  Zacas,
+  Zabha,
+  Zcmp,
+  Count,
+};
+
+enum class RISCVSubtargetOption : std::uint8_t {
+  DisablePostMISchedLoadClustering,
+  DisablePostMISchedStoreClustering,
+  FusionAddLoad,
+  FusionAddMemory,
+  FusionAddImmediateLoad,
+  FusionAUIPCAddImmediate,
+  FusionAUIPCLoad,
+  FusionBitfieldExtract,
+  FusionLoadDoubleAdd,
+  FusionLogicImmediateRegister,
+  FusionLogicRegisterImmediate,
+  FusionLogicRegisterRegister,
+  FusionLUIAddImmediate,
+  FusionLUILoad,
+  FusionMultiplyAdd,
+  FusionShiftBitExtract,
+  FusionShiftedAddLoad,
+  FusionShiftedZeroExtendWord,
+  FusionZeroExtendHalf,
+  FusionZeroExtendWord,
+  PreferWordInstructions,
+  ReserveX6,
+  ReserveX7,
+  SaveRestore,
+  TaggedGlobals,
+  UnalignedScalarMemory,
+  UsePostRAScheduler,
+  Count,
+};
+
+enum class RISCVABI : std::uint8_t {
+  LP64,
+  LP64D,
+};
+
+[[nodiscard]] Expected<RISCVABI> parseRISCVABI(std::string_view Name);
+
+class RISCVSubtargetFeatures final {
+public:
+  [[nodiscard]] static Expected<RISCVSubtargetFeatures>
+  fromFeatureList(std::span<const std::string> Features);
+  [[nodiscard]] static RISCVSubtargetFeatures rv64gc() noexcept;
+
+  [[nodiscard]] bool has(RISCVExtension Extension) const noexcept;
+  [[nodiscard]] bool has(RISCVSubtargetOption Option) const noexcept;
+  [[nodiscard]] bool hasFeature(std::string_view Feature) const noexcept;
+
+  friend bool operator==(const RISCVSubtargetFeatures &Left,
+                         const RISCVSubtargetFeatures &Right) = default;
+
+private:
+  explicit constexpr RISCVSubtargetFeatures(std::uint16_t Enabled,
+                                            std::uint32_t Options = 0) noexcept
+      : Enabled(Enabled), Options(Options) {}
+
+  std::uint16_t Enabled = 0;
+  std::uint32_t Options = 0;
+};
+
+class RISCVSubtarget final {
+public:
+  explicit RISCVSubtarget(RISCVSubtargetFeatures Features,
+                          RelocationModel Relocation = RelocationModel::Static,
+                          CodeModel Code = CodeModel::Small, RISCVABI ABI = RISCVABI::LP64D);
+  RISCVSubtarget(const RISCVSubtarget &) = delete;
+  RISCVSubtarget &operator=(const RISCVSubtarget &) = delete;
+  RISCVSubtarget(RISCVSubtarget &&) = delete;
+  RISCVSubtarget &operator=(RISCVSubtarget &&) = delete;
+  ~RISCVSubtarget();
+
+  [[nodiscard]] const RISCVSubtargetFeatures &features() const noexcept {
+    return Features;
+  }
+
+  [[nodiscard]] RelocationModel relocationModel() const noexcept {
+    return Relocation;
+  }
+
+  [[nodiscard]] CodeModel codeModel() const noexcept {
+    return Code;
+  }
+
+  [[nodiscard]] RISCVABI targetABI() const noexcept {
+    return ABI;
+  }
+
+  [[nodiscard]] const TargetCallLowering *getCallLowering() const;
+  [[nodiscard]] InstructionSelector *getInstructionSelector() const;
+  [[nodiscard]] const LegalizerInfo *getLegalizerInfo() const;
+  [[nodiscard]] const RISCVRegisterBankInfo *getRegBankInfo() const;
+  [[nodiscard]] const TargetFrameLowering &frameLowering() const noexcept;
+  [[nodiscard]] const TargetSchedulingModel &schedulingModel() const noexcept;
+
+private:
+  RISCVSubtargetFeatures Features;
+  RelocationModel Relocation;
+  CodeModel Code;
+  RISCVABI ABI;
+  std::unique_ptr<TargetFrameLowering> FrameLoweringInfo;
+  std::unique_ptr<TargetCallLowering> CallLoweringInfo;
+  std::unique_ptr<InstructionSelector> InstSelector;
+  std::unique_ptr<LegalizerInfo> Legalizer;
+  std::unique_ptr<RISCVRegisterBankInfo> RegBankInfo;
+  std::unique_ptr<TargetSchedulingHooks> SchedulingHooks;
+  std::unique_ptr<TargetSchedulingModel> SchedulingModel;
+};
+
+} // namespace riscv
+} // namespace rcc
+
+#endif // RCC_TARGET_RISCV_RISCVSUBTARGET_H