From 540c73a2f450af3d0aec6e039fab054471efdbb1 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Mon, 24 Aug 2026 16:37:25 +0800
Subject: [RISCV] Match LLVM frame lowering semantics

---
 backend/include/rcc/Target/RISCV/RISCVSubtarget.h | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

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

diff --git a/backend/include/rcc/Target/RISCV/RISCVSubtarget.h b/backend/include/rcc/Target/RISCV/RISCVSubtarget.h
index c8a4298..52b99af 100644
--- a/backend/include/rcc/Target/RISCV/RISCVSubtarget.h
+++ b/backend/include/rcc/Target/RISCV/RISCVSubtarget.h
@@ -71,6 +71,13 @@ enum class RISCVSubtargetOption : std::uint8_t {
   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>
@@ -97,7 +104,7 @@ class RISCVSubtarget final {
 public:
   explicit RISCVSubtarget(RISCVSubtargetFeatures Features,
                           RelocationModel Relocation = RelocationModel::Static,
-                          CodeModel Code = CodeModel::Small);
+                          CodeModel Code = CodeModel::Small, RISCVABI ABI = RISCVABI::LP64D);
   RISCVSubtarget(const RISCVSubtarget &) = delete;
   RISCVSubtarget &operator=(const RISCVSubtarget &) = delete;
   RISCVSubtarget(RISCVSubtarget &&) = delete;
@@ -116,6 +123,10 @@ public:
     return Code;
   }
 
+  [[nodiscard]] RISCVABI targetABI() const noexcept {
+    return ABI;
+  }
+
   [[nodiscard]] const TargetCallLowering *getCallLowering() const;
   [[nodiscard]] InstructionSelector *getInstructionSelector() const;
   [[nodiscard]] const LegalizerInfo *getLegalizerInfo() const;
@@ -126,6 +137,7 @@ private:
   RISCVSubtargetFeatures Features;
   RelocationModel Relocation;
   CodeModel Code;
+  RISCVABI ABI;
   mutable std::unique_ptr<TargetCallLowering> CallLoweringInfo;
   mutable std::unique_ptr<InstructionSelector> InstSelector;
   mutable std::unique_ptr<LegalizerInfo> Legalizer;
-- 
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