1 //===-- MipsFrameLowering.h - Define frame lowering for Mips ----*- 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 //
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_MIPS_MIPSFRAMELOWERING_H
15 #define LLVM_LIB_TARGET_MIPS_MIPSFRAMELOWERING_H
16 
17 #include "Mips.h"
18 #include "llvm/CodeGen/TargetFrameLowering.h"
19 
20 namespace llvm {
21   class MipsSubtarget;
22 
23 class MipsFrameLowering : public TargetFrameLowering {
24 protected:
25   const MipsSubtarget &STI;
26 
27 public:
MipsFrameLowering(const MipsSubtarget & sti,unsigned Alignment)28   explicit MipsFrameLowering(const MipsSubtarget &sti, unsigned Alignment)
29     : TargetFrameLowering(StackGrowsDown, Alignment, 0, Alignment), STI(sti) {}
30 
31   static const MipsFrameLowering *create(const MipsSubtarget &ST);
32 
33   bool hasFP(const MachineFunction &MF) const override;
34 
35   bool hasBP(const MachineFunction &MF) const;
36 
isFPCloseToIncomingSP()37   bool isFPCloseToIncomingSP() const override { return false; }
38 
enableShrinkWrapping(const MachineFunction & MF)39   bool enableShrinkWrapping(const MachineFunction &MF) const override {
40     return true;
41   }
42 
43   MachineBasicBlock::iterator
44   eliminateCallFramePseudoInstr(MachineFunction &MF,
45                                 MachineBasicBlock &MBB,
46                                 MachineBasicBlock::iterator I) const override;
47 
48 protected:
49   uint64_t estimateStackSize(const MachineFunction &MF) const;
50 };
51 
52 /// Create MipsFrameLowering objects.
53 const MipsFrameLowering *createMips16FrameLowering(const MipsSubtarget &ST);
54 const MipsFrameLowering *createMipsSEFrameLowering(const MipsSubtarget &ST);
55 
56 } // End llvm namespace
57 
58 #endif
59