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