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      1 //===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- C++ -*-==//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This class implements X86-specific bits of TargetFrameLowering class.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #ifndef X86_FRAMELOWERING_H
     15 #define X86_FRAMELOWERING_H
     16 
     17 #include "X86Subtarget.h"
     18 #include "llvm/MC/MCDwarf.h"
     19 #include "llvm/Target/TargetFrameLowering.h"
     20 
     21 namespace llvm {
     22   class MCSymbol;
     23   class X86TargetMachine;
     24 
     25 class X86FrameLowering : public TargetFrameLowering {
     26   const X86TargetMachine &TM;
     27   const X86Subtarget &STI;
     28 public:
     29   explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti)
     30     : TargetFrameLowering(StackGrowsDown,
     31                           sti.getStackAlignment(),
     32                           (sti.is64Bit() ? -8 : -4)),
     33       TM(tm), STI(sti) {
     34   }
     35 
     36   void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label,
     37                                  unsigned FramePtr) const;
     38 
     39   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
     40   /// the function.
     41   void emitPrologue(MachineFunction &MF) const;
     42   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
     43 
     44   void adjustForSegmentedStacks(MachineFunction &MF) const;
     45 
     46   void adjustForHiPEPrologue(MachineFunction &MF) const;
     47 
     48   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
     49                                             RegScavenger *RS = NULL) const;
     50 
     51   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
     52                                  MachineBasicBlock::iterator MI,
     53                                  const std::vector<CalleeSavedInfo> &CSI,
     54                                  const TargetRegisterInfo *TRI) const;
     55 
     56   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
     57                                    MachineBasicBlock::iterator MI,
     58                                    const std::vector<CalleeSavedInfo> &CSI,
     59                                    const TargetRegisterInfo *TRI) const;
     60 
     61   bool hasFP(const MachineFunction &MF) const;
     62   bool hasReservedCallFrame(const MachineFunction &MF) const;
     63 
     64   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
     65   int getFrameIndexReference(const MachineFunction &MF, int FI,
     66                              unsigned &FrameReg) const;
     67   uint32_t getCompactUnwindEncoding(MachineFunction &MF) const;
     68 
     69   void eliminateCallFramePseudoInstr(MachineFunction &MF,
     70                                      MachineBasicBlock &MBB,
     71                                      MachineBasicBlock::iterator MI) const;
     72 };
     73 
     74 } // End llvm namespace
     75 
     76 #endif
     77