[NDS32 5/46] Add preliminary NDS32 Frame Lowering class

[shiva0217]

Summary

Add preliminary NDS32 Frame Lowering class

lib/Target/NDS32/CMakeLists.txt

 set(LLVM_TARGET_DEFINITIONS NDS32.td)
 
 tablegen(LLVM NDS32GenSubtargetInfo.inc -gen-subtarget)
 
 add_public_tablegen_target(NDS32CommonTableGen)
 
 
 add_llvm_target(NDS32CodeGen
   NDS32TargetMachine.cpp
   NDS32Subtarget.cpp
+  NDS32FrameLowering.cpp
   )
 
 add_subdirectory(TargetInfo)
 add_subdirectory(MCTargetDesc)

lib/Target/NDS32/NDS32FrameLowering.h

+//==-- NDS32FrameLowering.h - Define frame lowering for NDS32 --*- C++ -*---==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_NDS32_NDS32FRAMELOWERING_H
+#define LLVM_LIB_TARGET_NDS32_NDS32FRAMELOWERING_H
+
+#include "NDS32.h"
+#include "llvm/Target/TargetFrameLowering.h"
+
+namespace llvm {
+class NDS32FrameLowering : public TargetFrameLowering {
+protected:
+
+public:
+  // Frame growing down and always 8-byte alignment for NDS32 target.
+  // Local area offset is 0 for NDS32.
+  explicit NDS32FrameLowering()
+      : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 8, 0, 8) {}
+  /// 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 spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                 MachineBasicBlock::iterator MI,
+                                 const std::vector<CalleeSavedInfo> &CSI,
+                                 const TargetRegisterInfo *TRI) const override;
+  bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+                                   MachineBasicBlock::iterator MI,
+                                   const std::vector<CalleeSavedInfo> &CSI,
+                                   const TargetRegisterInfo *TRI) const override;
+
+  int getFrameIndexReference(const MachineFunction &MF, int FI,
+                             unsigned &FrameReg) const override;
+
+  bool hasFP(const MachineFunction &MF) const override;
+  bool hasReservedCallFrame(const MachineFunction &MF) const override;
+  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+                            RegScavenger *RS) const override;
+};
+
+} // End llvm namespace
+
+#endif

lib/Target/NDS32/NDS32FrameLowering.cpp

+//===-- NDS32FrameLowering.cpp - NDS32 Frame Information ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the NDS32 implementation of TargetFrameLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "NDS32FrameLowering.h"
+#include "NDS32Subtarget.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
+#include "llvm/Target/TargetOptions.h"
+
+using namespace llvm;
+
+bool NDS32FrameLowering::hasFP(const MachineFunction &MF) const {
+  const MachineFrameInfo &MFI = MF.getFrameInfo();
+
+  return (MF.getTarget().Options.DisableFramePointerElim(MF) ||
+          MF.getFrameInfo().hasVarSizedObjects() ||
+          MFI.isFrameAddressTaken());
+}
+
+bool NDS32FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
+  return !MF.getFrameInfo().hasVarSizedObjects();
+}
+
+void NDS32FrameLowering::emitPrologue(MachineFunction &MF,
+                                      MachineBasicBlock &MBB) const {
+}
+
+
+void NDS32FrameLowering::emitEpilogue(MachineFunction &MF,
+                                      MachineBasicBlock &MBB) const {
+}
+
+bool NDS32FrameLowering::
+spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+                          MachineBasicBlock::iterator MI,
+                          const std::vector<CalleeSavedInfo> &CSI,
+                          const TargetRegisterInfo *TRI) const {
+  return false;
+}
+
+bool NDS32FrameLowering::
+restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+                            MachineBasicBlock::iterator MI,
+                            const std::vector<CalleeSavedInfo> &CSI,
+                            const TargetRegisterInfo *TRI) const {
+  return false;
+}
+
+int NDS32FrameLowering::getFrameIndexReference(const MachineFunction &MF,
+                                               int FI,
+                                               unsigned &FrameReg) const {
+  return 0;
+}
+
+MachineBasicBlock::iterator NDS32FrameLowering::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+                              MachineBasicBlock::iterator MI) const {
+  return MBB.erase(MI);
+}
+
+void NDS32FrameLowering::determineCalleeSaves(MachineFunction &MF,
+                                              BitVector &SavedRegs,
+                                              RegScavenger *RS) const {
+}

lib/Target/NDS32/NDS32Subtarget.h

 //===-- NDS32Subtarget.h - Define Subtarget for the NDS32 ----*- C++ -*----===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the NDS32 specific subclass of TargetSubtargetInfo.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_TARGET_NDS32_NDS32SUBTARGET_H
 #define LLVM_LIB_TARGET_NDS32_NDS32SUBTARGET_H
 
+#include "NDS32FrameLowering.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/Target/TargetSubtargetInfo.h"
 #include <string>
 
 #define GET_SUBTARGETINFO_HEADER
 #include "NDS32GenSubtargetInfo.inc"
 
 namespace llvm {
 class StringRef;
 
 class NDS32Subtarget : public NDS32GenSubtargetInfo {
   virtual void anchor();
+  NDS32FrameLowering FrameLowering;
 
 public:
   /// This constructor initializes the data members to match that
   /// of the specified triple.
   ///
   NDS32Subtarget(const Triple &TT, const std::string &CPU,
                  const std::string &FS, const TargetMachine &TM);
 
   NDS32Subtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
 
   /// ParseSubtargetFeatures - Parses features string setting specified
   /// subtarget options.  Definition of function is auto generated by tblgen.
   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
 
+  const TargetFrameLowering *getFrameLowering() const override {
+    return &FrameLowering;
+  }
 protected:
   /// No16Bit - Not generate 16-Bit ISA
   bool No16Bit = false;
 
 public:
   bool has16Bit() const { return !No16Bit; }
 };
 } // End llvm namespace
 
 #endif  // LLVM_TARGET_NDS32_SUBTARGET_H

lib/Target/NDS32/NDS32Subtarget.cpp

 NDS32Subtarget &
 NDS32Subtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
   ParseSubtargetFeatures(CPU, FS);
   return *this;
 }
 
 NDS32Subtarget::NDS32Subtarget(const Triple &TT, const std::string &CPU,
                                const std::string &FS, const TargetMachine &TM)
-    : NDS32GenSubtargetInfo(TT, CPU, FS) {
+    : NDS32GenSubtargetInfo(TT, CPU, FS), FrameLowering() {
   ParseSubtargetFeatures(CPU, FS);
 }