| //===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- 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 X86-specific bits of TargetFrameLowering class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef X86_FRAMELOWERING_H |
| #define X86_FRAMELOWERING_H |
| |
| #include "X86Subtarget.h" |
| #include "llvm/MC/MCDwarf.h" |
| #include "llvm/Target/TargetFrameLowering.h" |
| |
| namespace llvm { |
| |
| namespace CU { |
| |
| /// Compact unwind encoding values. |
| enum CompactUnwindEncodings { |
| /// [RE]BP based frame where [RE]BP is pused on the stack immediately after |
| /// the return address, then [RE]SP is moved to [RE]BP. |
| UNWIND_MODE_BP_FRAME = 0x01000000, |
| |
| /// A frameless function with a small constant stack size. |
| UNWIND_MODE_STACK_IMMD = 0x02000000, |
| |
| /// A frameless function with a large constant stack size. |
| UNWIND_MODE_STACK_IND = 0x03000000, |
| |
| /// No compact unwind encoding is available. |
| UNWIND_MODE_DWARF = 0x04000000, |
| |
| /// Mask for encoding the frame registers. |
| UNWIND_BP_FRAME_REGISTERS = 0x00007FFF, |
| |
| /// Mask for encoding the frameless registers. |
| UNWIND_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF |
| }; |
| |
| } // end CU namespace |
| |
| class MCSymbol; |
| class X86TargetMachine; |
| |
| class X86FrameLowering : public TargetFrameLowering { |
| const X86TargetMachine &TM; |
| const X86Subtarget &STI; |
| public: |
| explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti) |
| : TargetFrameLowering(StackGrowsDown, |
| sti.getStackAlignment(), |
| (sti.is64Bit() ? -8 : -4)), |
| TM(tm), STI(sti) { |
| } |
| |
| void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label, |
| unsigned FramePtr) const; |
| |
| /// emitProlog/emitEpilog - These methods insert prolog and epilog code into |
| /// the function. |
| void emitPrologue(MachineFunction &MF) const; |
| void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const; |
| |
| void adjustForSegmentedStacks(MachineFunction &MF) const; |
| |
| void adjustForHiPEPrologue(MachineFunction &MF) const; |
| |
| void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, |
| RegScavenger *RS = NULL) const; |
| |
| bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| const std::vector<CalleeSavedInfo> &CSI, |
| const TargetRegisterInfo *TRI) const; |
| |
| bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| const std::vector<CalleeSavedInfo> &CSI, |
| const TargetRegisterInfo *TRI) const; |
| |
| bool hasFP(const MachineFunction &MF) const; |
| bool hasReservedCallFrame(const MachineFunction &MF) const; |
| |
| int getFrameIndexOffset(const MachineFunction &MF, int FI) const; |
| int getFrameIndexReference(const MachineFunction &MF, int FI, |
| unsigned &FrameReg) const; |
| uint32_t getCompactUnwindEncoding(MachineFunction &MF) const; |
| |
| void eliminateCallFramePseudoInstr(MachineFunction &MF, |
| MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI) const; |
| }; |
| |
| } // End llvm namespace |
| |
| #endif |