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