xref: /minix3/external/bsd/llvm/dist/llvm/lib/Target/X86/X86FrameLowering.h (revision 0a6a1f1d05b60e214de2f05a7310ddd1f0e590e7)
1f4a2713aSLionel Sambuc //===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- C++ -*-==//
2f4a2713aSLionel Sambuc //
3f4a2713aSLionel Sambuc //                     The LLVM Compiler Infrastructure
4f4a2713aSLionel Sambuc //
5f4a2713aSLionel Sambuc // This file is distributed under the University of Illinois Open Source
6f4a2713aSLionel Sambuc // License. See LICENSE.TXT for details.
7f4a2713aSLionel Sambuc //
8f4a2713aSLionel Sambuc //===----------------------------------------------------------------------===//
9f4a2713aSLionel Sambuc //
10f4a2713aSLionel Sambuc // This class implements X86-specific bits of TargetFrameLowering class.
11f4a2713aSLionel Sambuc //
12f4a2713aSLionel Sambuc //===----------------------------------------------------------------------===//
13f4a2713aSLionel Sambuc 
14*0a6a1f1dSLionel Sambuc #ifndef LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
15*0a6a1f1dSLionel Sambuc #define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
16f4a2713aSLionel Sambuc 
17f4a2713aSLionel Sambuc #include "llvm/Target/TargetFrameLowering.h"
18f4a2713aSLionel Sambuc 
19f4a2713aSLionel Sambuc namespace llvm {
20f4a2713aSLionel Sambuc 
21f4a2713aSLionel Sambuc class MCSymbol;
22f4a2713aSLionel Sambuc class X86TargetMachine;
23*0a6a1f1dSLionel Sambuc class X86Subtarget;
24f4a2713aSLionel Sambuc 
25f4a2713aSLionel Sambuc class X86FrameLowering : public TargetFrameLowering {
26f4a2713aSLionel Sambuc public:
X86FrameLowering(StackDirection D,unsigned StackAl,int LAO)27*0a6a1f1dSLionel Sambuc   explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO)
28*0a6a1f1dSLionel Sambuc     : TargetFrameLowering(StackGrowsDown, StackAl, LAO) {}
29f4a2713aSLionel Sambuc 
30*0a6a1f1dSLionel Sambuc   /// Emit a call to the target's stack probe function. This is required for all
31*0a6a1f1dSLionel Sambuc   /// large stack allocations on Windows. The caller is required to materialize
32*0a6a1f1dSLionel Sambuc   /// the number of bytes to probe in RAX/EAX.
33*0a6a1f1dSLionel Sambuc   static void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
34*0a6a1f1dSLionel Sambuc                                  MachineBasicBlock::iterator MBBI, DebugLoc DL);
35*0a6a1f1dSLionel Sambuc 
36*0a6a1f1dSLionel Sambuc   void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
37*0a6a1f1dSLionel Sambuc                                  MachineBasicBlock::iterator MBBI,
38*0a6a1f1dSLionel Sambuc                                  DebugLoc DL) const;
39f4a2713aSLionel Sambuc 
40f4a2713aSLionel Sambuc   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
41f4a2713aSLionel Sambuc   /// the function.
42*0a6a1f1dSLionel Sambuc   void emitPrologue(MachineFunction &MF) const override;
43*0a6a1f1dSLionel Sambuc   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
44f4a2713aSLionel Sambuc 
45*0a6a1f1dSLionel Sambuc   void adjustForSegmentedStacks(MachineFunction &MF) const override;
46f4a2713aSLionel Sambuc 
47*0a6a1f1dSLionel Sambuc   void adjustForHiPEPrologue(MachineFunction &MF) const override;
48f4a2713aSLionel Sambuc 
49f4a2713aSLionel Sambuc   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
50*0a6a1f1dSLionel Sambuc                                      RegScavenger *RS = nullptr) const override;
51*0a6a1f1dSLionel Sambuc 
52*0a6a1f1dSLionel Sambuc   bool
53*0a6a1f1dSLionel Sambuc   assignCalleeSavedSpillSlots(MachineFunction &MF,
54*0a6a1f1dSLionel Sambuc                               const TargetRegisterInfo *TRI,
55*0a6a1f1dSLionel Sambuc                               std::vector<CalleeSavedInfo> &CSI) const override;
56f4a2713aSLionel Sambuc 
57f4a2713aSLionel Sambuc   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
58f4a2713aSLionel Sambuc                                  MachineBasicBlock::iterator MI,
59f4a2713aSLionel Sambuc                                  const std::vector<CalleeSavedInfo> &CSI,
60*0a6a1f1dSLionel Sambuc                                  const TargetRegisterInfo *TRI) const override;
61f4a2713aSLionel Sambuc 
62f4a2713aSLionel Sambuc   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
63f4a2713aSLionel Sambuc                                   MachineBasicBlock::iterator MI,
64f4a2713aSLionel Sambuc                                   const std::vector<CalleeSavedInfo> &CSI,
65*0a6a1f1dSLionel Sambuc                                   const TargetRegisterInfo *TRI) const override;
66f4a2713aSLionel Sambuc 
67*0a6a1f1dSLionel Sambuc   bool hasFP(const MachineFunction &MF) const override;
68*0a6a1f1dSLionel Sambuc   bool hasReservedCallFrame(const MachineFunction &MF) const override;
69f4a2713aSLionel Sambuc 
70*0a6a1f1dSLionel Sambuc   int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
71f4a2713aSLionel Sambuc   int getFrameIndexReference(const MachineFunction &MF, int FI,
72*0a6a1f1dSLionel Sambuc                              unsigned &FrameReg) const override;
73*0a6a1f1dSLionel Sambuc 
74*0a6a1f1dSLionel Sambuc   int getFrameIndexOffsetFromSP(const MachineFunction &MF, int FI) const;
75*0a6a1f1dSLionel Sambuc   int getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI,
76*0a6a1f1dSLionel Sambuc                                    unsigned &FrameReg) const override;
77f4a2713aSLionel Sambuc 
78f4a2713aSLionel Sambuc   void eliminateCallFramePseudoInstr(MachineFunction &MF,
79f4a2713aSLionel Sambuc                                  MachineBasicBlock &MBB,
80*0a6a1f1dSLionel Sambuc                                  MachineBasicBlock::iterator MI) const override;
81*0a6a1f1dSLionel Sambuc 
82*0a6a1f1dSLionel Sambuc private:
83*0a6a1f1dSLionel Sambuc   /// convertArgMovsToPushes - This method tries to convert a call sequence
84*0a6a1f1dSLionel Sambuc   /// that uses sub and mov instructions to put the argument onto the stack
85*0a6a1f1dSLionel Sambuc   /// into a series of pushes.
86*0a6a1f1dSLionel Sambuc   /// Returns true if the transformation succeeded, false if not.
87*0a6a1f1dSLionel Sambuc   bool convertArgMovsToPushes(MachineFunction &MF,
88*0a6a1f1dSLionel Sambuc                               MachineBasicBlock &MBB,
89*0a6a1f1dSLionel Sambuc                               MachineBasicBlock::iterator I,
90*0a6a1f1dSLionel Sambuc                               uint64_t Amount) const;
91f4a2713aSLionel Sambuc };
92f4a2713aSLionel Sambuc 
93f4a2713aSLionel Sambuc } // End llvm namespace
94f4a2713aSLionel Sambuc 
95f4a2713aSLionel Sambuc #endif
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