X86MachineFunctionInfo.h revision 193574 
1//====- X86MachineFuctionInfo.h - X86 machine function info -----*- 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 file declares X86-specific per-machine-function information.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef X86MACHINEFUNCTIONINFO_H
15#define X86MACHINEFUNCTIONINFO_H
16
17#include "llvm/CodeGen/MachineFunction.h"
18
19namespace llvm {
20
21enum NameDecorationStyle {
22  None,
23  StdCall,
24  FastCall
25};
26
27/// X86MachineFunctionInfo - This class is derived from MachineFunction and
28/// contains private X86 target-specific information for each MachineFunction.
29class X86MachineFunctionInfo : public MachineFunctionInfo {
30  /// ForceFramePointer - True if the function is required to use of frame
31  /// pointer for reasons other than it containing dynamic allocation or
32  /// that FP eliminatation is turned off. For example, Cygwin main function
33  /// contains stack pointer re-alignment code which requires FP.
34  bool ForceFramePointer;
35
36  /// CalleeSavedFrameSize - Size of the callee-saved register portion of the
37  /// stack frame in bytes.
38  unsigned CalleeSavedFrameSize;
39
40  /// BytesToPopOnReturn - Number of bytes function pops on return.
41  /// Used on windows platform for stdcall & fastcall name decoration
42  unsigned BytesToPopOnReturn;
43
44  /// DecorationStyle - If the function requires additional name decoration,
45  /// DecorationStyle holds the right way to do so.
46  NameDecorationStyle DecorationStyle;
47
48  /// ReturnAddrIndex - FrameIndex for return slot.
49  int ReturnAddrIndex;
50
51  /// TailCallReturnAddrDelta - Delta the ReturnAddr stack slot is moved
52  /// Used for creating an area before the register spill area on the stack
53  /// the returnaddr can be savely move to this area
54  int TailCallReturnAddrDelta;
55
56  /// SRetReturnReg - Some subtargets require that sret lowering includes
57  /// returning the value of the returned struct in a register. This field
58  /// holds the virtual register into which the sret argument is passed.
59  unsigned SRetReturnReg;
60
61  /// GlobalBaseReg - keeps track of the virtual register initialized for
62  /// use as the global base register. This is used for PIC in some PIC
63  /// relocation models.
64  unsigned GlobalBaseReg;
65
66public:
67  X86MachineFunctionInfo() : ForceFramePointer(false),
68                             CalleeSavedFrameSize(0),
69                             BytesToPopOnReturn(0),
70                             DecorationStyle(None),
71                             ReturnAddrIndex(0),
72                             TailCallReturnAddrDelta(0),
73                             SRetReturnReg(0),
74                             GlobalBaseReg(0) {}
75
76  explicit X86MachineFunctionInfo(MachineFunction &MF)
77    : ForceFramePointer(false),
78      CalleeSavedFrameSize(0),
79      BytesToPopOnReturn(0),
80      DecorationStyle(None),
81      ReturnAddrIndex(0),
82      TailCallReturnAddrDelta(0),
83      SRetReturnReg(0),
84      GlobalBaseReg(0) {}
85
86  bool getForceFramePointer() const { return ForceFramePointer;}
87  void setForceFramePointer(bool forceFP) { ForceFramePointer = forceFP; }
88
89  unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
90  void setCalleeSavedFrameSize(unsigned bytes) { CalleeSavedFrameSize = bytes; }
91
92  unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
93  void setBytesToPopOnReturn (unsigned bytes) { BytesToPopOnReturn = bytes;}
94
95  NameDecorationStyle getDecorationStyle() const { return DecorationStyle; }
96  void setDecorationStyle(NameDecorationStyle style) { DecorationStyle = style;}
97
98  int getRAIndex() const { return ReturnAddrIndex; }
99  void setRAIndex(int Index) { ReturnAddrIndex = Index; }
100
101  int getTCReturnAddrDelta() const { return TailCallReturnAddrDelta; }
102  void setTCReturnAddrDelta(int delta) {TailCallReturnAddrDelta = delta;}
103
104  unsigned getSRetReturnReg() const { return SRetReturnReg; }
105  void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
106
107  unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
108  void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
109};
110
111} // End llvm namespace
112
113#endif
114