From f99ef4322a7a2c09380fff61f88ab9440f05a92c Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Fri, 7 Aug 2026 22:06:28 +0800
Subject: [CodeGen] Complete machine pass and ABI lowering infrastructure

---
 .../include/rcc/Target/RISCV/RISCVCallLowering.h   | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 backend/include/rcc/Target/RISCV/RISCVCallLowering.h

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

diff --git a/backend/include/rcc/Target/RISCV/RISCVCallLowering.h b/backend/include/rcc/Target/RISCV/RISCVCallLowering.h
new file mode 100644
index 0000000..445c922
--- /dev/null
+++ b/backend/include/rcc/Target/RISCV/RISCVCallLowering.h
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_TARGET_RISCV_RISCVCALLLOWERING_H
+#define RCC_TARGET_RISCV_RISCVCALLLOWERING_H
+
+#include "rcc/CodeGen/TargetCallLowering.h"
+#include "rcc/Target/RISCV/RISCVInstructions.h"
+
+#include <cstdint>
+
+namespace rcc::riscv {
+
+enum class CallTargetFlag : std::uint32_t {
+  DirectCall = 1U << 0U,
+};
+
+enum class CallStackObjectFlag : std::uint64_t {
+  IncomingArgument = 1ULL << 0U,
+  OutgoingArgument = 1ULL << 1U,
+  ByValCopy = 1ULL << 2U,
+  VarArgSaveArea = 1ULL << 3U,
+  VarArgAlignmentPadding = 1ULL << 4U,
+};
+
+enum class CallValueTransform : std::uint8_t {
+  Full,
+  AnyExtend,
+  SignExtend,
+  ZeroExtend,
+  Truncate,
+  Bitcast,
+};
+
+[[nodiscard]] constexpr CallingConventionID
+callingConventionID(CallingConvention Convention) noexcept {
+  return CallingConventionID::fromValue(static_cast<std::uint32_t>(Convention));
+}
+
+[[nodiscard]] const TargetCallLowering &callLowering() noexcept;
+
+} // namespace rcc::riscv
+
+#endif // RCC_TARGET_RISCV_RISCVCALLLOWERING_H
-- 
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