Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/lib/Target/Lanai/LanaiFrameLowering.h

@@ -0,0 +1,57 @@
+//===-- LanaiFrameLowering.h - Define frame lowering for Lanai --*- 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 Lanai-specific bits of TargetFrameLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
+#define LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
+
+#include "Lanai.h"
+#include "llvm/CodeGen/TargetFrameLowering.h"
+
+namespace llvm {
+
+class BitVector;
+class LanaiSubtarget;
+
+class LanaiFrameLowering : public TargetFrameLowering {
+private:
+  void determineFrameLayout(MachineFunction &MF) const;
+  void replaceAdjDynAllocPseudo(MachineFunction &MF) const;
+
+protected:
+  const LanaiSubtarget &STI;
+
+public:
+  explicit LanaiFrameLowering(const LanaiSubtarget &Subtarget)
+      : TargetFrameLowering(StackGrowsDown,
+                            /*StackAlignment=*/8,
+                            /*LocalAreaOffset=*/0),
+        STI(Subtarget) {}
+
+  // emitProlog/emitEpilog - These methods insert prolog and epilog code into
+  // the function.
+  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
+
+  MachineBasicBlock::iterator
+  eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+                                MachineBasicBlock::iterator I) const override;
+
+  bool hasFP(const MachineFunction & /*MF*/) const override { return true; }
+
+  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+                            RegScavenger *RS = nullptr) const override;
+};
+
+} // namespace llvm
+
+#endif // LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H