From 81afb6570000472c182e5b1f540f69382602aaad Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Mon, 24 Aug 2026 17:30:29 +0800
Subject: [RISCV] Match LLVM emergency spill layout

---
 backend/include/rcc/CodeGen/MachineOptimizationPipeline.h |  2 ++
 backend/include/rcc/CodeGen/PrologueEpilogueInsertion.h   | 11 +++++++----
 backend/include/rcc/CodeGen/TargetFrameLowering.h         |  7 ++++++-
 backend/include/rcc/Target/RISCV/RISCVPipeline.h          |  1 +
 4 files changed, 16 insertions(+), 5 deletions(-)

(limited to 'backend/include')

diff --git a/backend/include/rcc/CodeGen/MachineOptimizationPipeline.h b/backend/include/rcc/CodeGen/MachineOptimizationPipeline.h
index d4abf74..c436455 100644
--- a/backend/include/rcc/CodeGen/MachineOptimizationPipeline.h
+++ b/backend/include/rcc/CodeGen/MachineOptimizationPipeline.h
@@ -5,6 +5,7 @@
 
 #include "rcc/CodeGen/MachinePassManager.h"
 #include "rcc/CodeGen/MachineScheduler.h"
+#include "rcc/CodeGen/TargetFrameLowering.h"
 
 namespace rcc {
 
@@ -23,6 +24,7 @@ struct MachineOptimizationPipelineTargetInfo final {
   const TargetPseudoExpansionInfo &PseudoExpansion;
   const TargetSchedulingModel &SchedulingModel;
   MachineSchedulerOptions SchedulerOptions;
+  FrameLoweringOptions FrameOptions;
 };
 
 struct MachineOptimizationPipelineOptions final {
diff --git a/backend/include/rcc/CodeGen/PrologueEpilogueInsertion.h b/backend/include/rcc/CodeGen/PrologueEpilogueInsertion.h
index a5d0028..dfade65 100644
--- a/backend/include/rcc/CodeGen/PrologueEpilogueInsertion.h
+++ b/backend/include/rcc/CodeGen/PrologueEpilogueInsertion.h
@@ -4,14 +4,15 @@
 #define RCC_CODEGEN_PROLOGUEEPILOGUEINSERTION_H
 
 #include "rcc/CodeGen/MachinePassManager.h"
+#include "rcc/CodeGen/TargetFrameLowering.h"
 
 namespace rcc {
 
-class TargetFrameLowering;
-
 class PrologueEpilogueInsertionPass final : public MachineFunctionPass {
 public:
-  explicit PrologueEpilogueInsertionPass(const TargetFrameLowering &Info) noexcept : Info(&Info) {}
+  explicit PrologueEpilogueInsertionPass(const TargetFrameLowering &Info,
+                                         FrameLoweringOptions Options = {}) noexcept
+      : Info(&Info), Options(Options) {}
 
   [[nodiscard]] const MachinePassContract &contract() const noexcept override;
   [[nodiscard]] Expected<MachinePassResult> run(MachineFunction &Function,
@@ -20,9 +21,11 @@ public:
 
 private:
   [[nodiscard]] Expected<MachinePassResult>
-  runImplementation(MachineFunction &Function, const TargetDescription &Target) const;
+  runImplementation(MachineFunction &Function, const TargetDescription &Target,
+                    FrameLoweringOptions RunOptions) const;
 
   const TargetFrameLowering *Info;
+  FrameLoweringOptions Options;
 };
 
 } // namespace rcc
diff --git a/backend/include/rcc/CodeGen/TargetFrameLowering.h b/backend/include/rcc/CodeGen/TargetFrameLowering.h
index b63ce22..705a548 100644
--- a/backend/include/rcc/CodeGen/TargetFrameLowering.h
+++ b/backend/include/rcc/CodeGen/TargetFrameLowering.h
@@ -23,12 +23,17 @@ struct FrameIndexReference final {
   std::int64_t Offset = 0;
 };
 
+struct FrameLoweringOptions final {
+  bool EmitDebugOutput = false;
+};
+
 class TargetFrameLowering {
 public:
   virtual ~TargetFrameLowering() = default;
 
   [[nodiscard]] virtual Expected<void> prepareFrame(MachineFunction &Function,
-                                                    const TargetDescription &Target) const = 0;
+                                                    const TargetDescription &Target,
+                                                    FrameLoweringOptions Options = {}) const = 0;
   [[nodiscard]] virtual Expected<void>
   insertCalleeSavedSpillsAndRestores(MachineFunction &Function,
                                      const TargetDescription &Target) const = 0;
diff --git a/backend/include/rcc/Target/RISCV/RISCVPipeline.h b/backend/include/rcc/Target/RISCV/RISCVPipeline.h
index 21a4461..50a6a68 100644
--- a/backend/include/rcc/Target/RISCV/RISCVPipeline.h
+++ b/backend/include/rcc/Target/RISCV/RISCVPipeline.h
@@ -25,6 +25,7 @@ struct RISCVPipelineOptions final {
   bool UseTargetCopyInstructions = false;
   GlobalISelAbortMode GlobalISelAbort = GlobalISelAbortMode::Enable;
   bool DebugMachineScheduler = false;
+  bool DebugPrologueEpilogue = false;
 };
 
 [[nodiscard]] Expected<void> addCanonicalPipeline(MachineFunctionPassManager &Pipeline,
-- 
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