131d157ae1ac2cd9c787dc3c1d28e64c682803844Jia Liu//===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- C++ -*-==// 233464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// 333464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// The LLVM Compiler Infrastructure 433464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// 533464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// This file is distributed under the University of Illinois Open Source 633464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// License. See LICENSE.TXT for details. 733464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// 833464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov//===----------------------------------------------------------------------===// 933464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// 1016c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov// This class implements X86-specific bits of TargetFrameLowering class. 1133464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov// 1233464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov//===----------------------------------------------------------------------===// 1333464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 1416c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov#ifndef X86_FRAMELOWERING_H 1516c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov#define X86_FRAMELOWERING_H 1633464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 1733464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov#include "X86Subtarget.h" 186a6b8c3e96b9e1ca7092eafd0cfb219cbbfbdfc4Bill Wendling#include "llvm/MC/MCDwarf.h" 1916c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov#include "llvm/Target/TargetFrameLowering.h" 2033464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 2133464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikovnamespace llvm { 2289ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 2389ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendlingnamespace CU { 2489ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 2589ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// Compact unwind encoding values. 2689ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling enum CompactUnwindEncodings { 2789ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// [RE]BP based frame where [RE]BP is pused on the stack immediately after 2889ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// the return address, then [RE]SP is moved to [RE]BP. 2989ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling UNWIND_MODE_BP_FRAME = 0x01000000, 3089ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 3189ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// A frameless function with a small constant stack size. 3289ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling UNWIND_MODE_STACK_IMMD = 0x02000000, 3389ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 3489ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// A frameless function with a large constant stack size. 3589ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling UNWIND_MODE_STACK_IND = 0x03000000, 3689ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 3789ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// No compact unwind encoding is available. 3889ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling UNWIND_MODE_DWARF = 0x04000000, 3989ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 4089ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// Mask for encoding the frame registers. 4189ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling UNWIND_BP_FRAME_REGISTERS = 0x00007FFF, 4289ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 4389ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling /// Mask for encoding the frameless registers. 4489ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling UNWIND_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF 4589ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling }; 4689ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 4789ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling} // end CU namespace 4889ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendling 4989ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendlingclass MCSymbol; 5089ec1c5c9c744c125b61145ed59783eb5c68ebf8Bill Wendlingclass X86TargetMachine; 5133464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 5216c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikovclass X86FrameLowering : public TargetFrameLowering { 53d9e3385ced2dc887e2fe8e1c071bd2611e4d3edeAnton Korobeynikov const X86TargetMachine &TM; 5433464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov const X86Subtarget &STI; 5533464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikovpublic: 5616c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov explicit X86FrameLowering(const X86TargetMachine &tm, const X86Subtarget &sti) 5716c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov : TargetFrameLowering(StackGrowsDown, 5816c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov sti.getStackAlignment(), 593f4be4fb86172e6b87a457b338483efc0c1efd05NAKAMURA Takumi (sti.is64Bit() ? -8 : -4)), 60d9e3385ced2dc887e2fe8e1c071bd2611e4d3edeAnton Korobeynikov TM(tm), STI(sti) { 6133464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov } 6233464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 6333464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov void emitCalleeSavedFrameMoves(MachineFunction &MF, MCSymbol *Label, 6433464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov unsigned FramePtr) const; 6533464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 6633464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 6733464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov /// the function. 6833464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov void emitPrologue(MachineFunction &MF) const; 6933464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const; 70d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov 7176927d758657b3a511c73467ec5a7288795c1513Rafael Espindola void adjustForSegmentedStacks(MachineFunction &MF) const; 7276927d758657b3a511c73467ec5a7288795c1513Rafael Espindola 7398fbe27ac8f0766ea94b89b8c03418131b72bea4Benjamin Kramer void adjustForHiPEPrologue(MachineFunction &MF) const; 7498fbe27ac8f0766ea94b89b8c03418131b72bea4Benjamin Kramer 7594c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, 7694c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov RegScavenger *RS = NULL) const; 7794c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov 78cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 79cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov MachineBasicBlock::iterator MI, 80cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov const std::vector<CalleeSavedInfo> &CSI, 81cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov const TargetRegisterInfo *TRI) const; 82cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov 8394c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 8494c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov MachineBasicBlock::iterator MI, 8594c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov const std::vector<CalleeSavedInfo> &CSI, 8694c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov const TargetRegisterInfo *TRI) const; 87cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov 88d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov bool hasFP(const MachineFunction &MF) const; 89d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov bool hasReservedCallFrame(const MachineFunction &MF) const; 90d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov 9182f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov int getFrameIndexOffset(const MachineFunction &MF, int FI) const; 92d07d06ceef942c478c0f75a4c4d7442e61ddff1dAlexey Samsonov int getFrameIndexReference(const MachineFunction &MF, int FI, 93d07d06ceef942c478c0f75a4c4d7442e61ddff1dAlexey Samsonov unsigned &FrameReg) const; 9409b02c8dddf822e84c30cc08e7759d6ceebb2334Bill Wendling uint32_t getCompactUnwindEncoding(MachineFunction &MF) const; 95700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky 96700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky void eliminateCallFramePseudoInstr(MachineFunction &MF, 97700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky MachineBasicBlock &MBB, 98700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky MachineBasicBlock::iterator MI) const; 9933464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov}; 10033464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 10133464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov} // End llvm namespace 10233464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 10333464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov#endif 104