1 files changed, 57 insertions, 0 deletions
diff --git a/lib/Target/RISCV/RISCVFrameLowering.h b/lib/Target/RISCV/RISCVFrameLowering.h
new file mode 100644
index 000000000000..d92bb70c76da
--- /dev/null
+++ b/lib/Target/RISCV/RISCVFrameLowering.h
@@ -0,0 +1,57 @@
+//===-- RISCVFrameLowering.h - Define frame lowering for RISCV -*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class implements RISCV-specific bits of TargetFrameLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H
+#define LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H
+
+#include "llvm/CodeGen/TargetFrameLowering.h"
+
+namespace llvm {
+class RISCVSubtarget;
+
+class RISCVFrameLowering : public TargetFrameLowering {
+public:
+  explicit RISCVFrameLowering(const RISCVSubtarget &STI)
+      : TargetFrameLowering(StackGrowsDown,
+                            /*StackAlignment=*/16,
+                            /*LocalAreaOffset=*/0),
+        STI(STI) {}
+
+  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+
+  int getFrameIndexReference(const MachineFunction &MF, int FI,
+                             unsigned &FrameReg) const override;
+
+  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+                            RegScavenger *RS) const override;
+
+  bool hasFP(const MachineFunction &MF) const override;
+
+  MachineBasicBlock::iterator
+  eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+                                MachineBasicBlock::iterator MI) const override {
+    return MBB.erase(MI);
+  }
+
+protected:
+  const RISCVSubtarget &STI;
+
+private:
+  void determineFrameLayout(MachineFunction &MF) const;
+  void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
+                 const DebugLoc &DL, unsigned DestReg, unsigned SrcReg,
+                 int64_t Val, MachineInstr::MIFlag Flag) const;
+};
+}
+#endif