1 files changed, 55 insertions, 0 deletions
diff --git a/backend/include/rcc/MC/MCAsmBackend.h b/backend/include/rcc/MC/MCAsmBackend.h
new file mode 100644
index 0000000..76e6214
--- /dev/null
+++ b/backend/include/rcc/MC/MCAsmBackend.h
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_MC_MCASMBACKEND_H
+#define RCC_MC_MCASMBACKEND_H
+
+#include "rcc/MC/MCFixup.h"
+#include "rcc/MC/MCInst.h"
+#include "rcc/Support/Error.h"
+
+#include <cstdint>
+#include <span>
+#include <vector>
+
+namespace rcc::mc {
+
+struct MCFixupKindInfo final {
+  std::uint8_t StorageSize = 0;
+  bool PCRelative = false;
+};
+
+struct MCFixupRelocation final {
+  std::uint32_t Type = 0;
+  MCSymbolRef Symbol;
+  std::int64_t Addend = 0;
+};
+
+class MCAsmBackend {
+public:
+  virtual ~MCAsmBackend() = default;
+
+  [[nodiscard]] virtual Expected<MCFixupKindInfo> fixupKindInfo(MCFixupKind Kind) const = 0;
+  [[nodiscard]] virtual Expected<void> applyFixup(MCFixupKind Kind, std::span<std::uint8_t> Data,
+                                                  std::uint64_t Offset,
+                                                  std::int64_t Value) const = 0;
+  [[nodiscard]] virtual Expected<std::uint32_t> relocationType(const MCFixup &Fixup,
+                                                               const MCValue &Value) const = 0;
+  [[nodiscard]] virtual Expected<std::vector<MCFixupRelocation>>
+  relocationsForFixup(const MCFixup &Fixup, const MCValue &Value) const;
+
+  [[nodiscard]] virtual bool mayNeedRelaxation(const MCInst &) const noexcept {
+    return false;
+  }
+  [[nodiscard]] virtual Expected<bool> fixupNeedsRelaxation(const MCFixup &, std::int64_t) const {
+    return false;
+  }
+  [[nodiscard]] virtual Expected<MCInst> relaxInstruction(const MCInst &) const;
+
+  [[nodiscard]] virtual std::uint32_t objectFlags() const noexcept {
+    return 0;
+  }
+};
+
+} // namespace rcc::mc
+
+#endif // RCC_MC_MCASMBACKEND_H