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//===-- 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
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