PPCMachineFunctionInfo.h revision 256281 
1//===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- 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 the PowerPC specific subclass of MachineFunctionInfo.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef PPC_MACHINE_FUNCTION_INFO_H
15#define PPC_MACHINE_FUNCTION_INFO_H
16
17#include "llvm/CodeGen/MachineFunction.h"
18
19namespace llvm {
20
21/// PPCFunctionInfo - This class is derived from MachineFunction private
22/// PowerPC target-specific information for each MachineFunction.
23class PPCFunctionInfo : public MachineFunctionInfo {
24  virtual void anchor();
25
26  /// FramePointerSaveIndex - Frame index of where the old frame pointer is
27  /// stored.  Also used as an anchor for instructions that need to be altered
28  /// when using frame pointers (dyna_add, dyna_sub.)
29  int FramePointerSaveIndex;
30
31  /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
32  ///
33  int ReturnAddrSaveIndex;
34
35  /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
36  /// function.  This is only valid after the initial scan of the function by
37  /// PEI.
38  bool MustSaveLR;
39
40  /// Does this function have any stack spills.
41  bool HasSpills;
42
43  /// Does this function spill using instructions with only r+r (not r+i)
44  /// forms.
45  bool HasNonRISpills;
46
47  /// SpillsCR - Indicates whether CR is spilled in the current function.
48  bool SpillsCR;
49
50  /// Indicates whether VRSAVE is spilled in the current function.
51  bool SpillsVRSAVE;
52
53  /// LRStoreRequired - The bool indicates whether there is some explicit use of
54  /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
55  /// requires that the code generator produce a store of LR to the stack on
56  /// entry, even though LR may otherwise apparently not be used.
57  bool LRStoreRequired;
58
59  /// MinReservedArea - This is the frame size that is at least reserved in a
60  /// potential caller (parameter+linkage area).
61  unsigned MinReservedArea;
62
63  /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
64  /// amount the stack pointer is adjusted to make the frame bigger for tail
65  /// calls. Used for creating an area before the register spill area.
66  int TailCallSPDelta;
67
68  /// HasFastCall - Does this function contain a fast call. Used to determine
69  /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
70  bool HasFastCall;
71
72  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
73  int VarArgsFrameIndex;
74  /// VarArgsStackOffset - StackOffset for start of stack
75  /// arguments.
76  int VarArgsStackOffset;
77  /// VarArgsNumGPR - Index of the first unused integer
78  /// register for parameter passing.
79  unsigned VarArgsNumGPR;
80  /// VarArgsNumFPR - Index of the first unused double
81  /// register for parameter passing.
82  unsigned VarArgsNumFPR;
83
84  /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
85  int CRSpillFrameIndex;
86
87  /// If any of CR[2-4] need to be saved in the prologue and restored in the
88  /// epilogue then they are added to this array. This is used for the
89  /// 64-bit SVR4 ABI.
90  SmallVector<unsigned, 3> MustSaveCRs;
91
92public:
93  explicit PPCFunctionInfo(MachineFunction &MF)
94    : FramePointerSaveIndex(0),
95      ReturnAddrSaveIndex(0),
96      HasSpills(false),
97      HasNonRISpills(false),
98      SpillsCR(false),
99      SpillsVRSAVE(false),
100      LRStoreRequired(false),
101      MinReservedArea(0),
102      TailCallSPDelta(0),
103      HasFastCall(false),
104      VarArgsFrameIndex(0),
105      VarArgsStackOffset(0),
106      VarArgsNumGPR(0),
107      VarArgsNumFPR(0),
108      CRSpillFrameIndex(0) {}
109
110  int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
111  void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
112
113  int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
114  void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
115
116  unsigned getMinReservedArea() const { return MinReservedArea; }
117  void setMinReservedArea(unsigned size) { MinReservedArea = size; }
118
119  int getTailCallSPDelta() const { return TailCallSPDelta; }
120  void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
121
122  /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
123  /// scan of the function. It is true if the LR/LR8 register is ever explicitly
124  /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
125  /// which is used in PIC generation), or if the LR stack slot is explicitly
126  /// referenced by builtin_return_address.
127  void setMustSaveLR(bool U) { MustSaveLR = U; }
128  bool mustSaveLR() const    { return MustSaveLR; }
129
130  void setHasSpills()      { HasSpills = true; }
131  bool hasSpills() const   { return HasSpills; }
132
133  void setHasNonRISpills()    { HasNonRISpills = true; }
134  bool hasNonRISpills() const { return HasNonRISpills; }
135
136  void setSpillsCR()       { SpillsCR = true; }
137  bool isCRSpilled() const { return SpillsCR; }
138
139  void setSpillsVRSAVE()       { SpillsVRSAVE = true; }
140  bool isVRSAVESpilled() const { return SpillsVRSAVE; }
141
142  void setLRStoreRequired() { LRStoreRequired = true; }
143  bool isLRStoreRequired() const { return LRStoreRequired; }
144
145  void setHasFastCall() { HasFastCall = true; }
146  bool hasFastCall() const { return HasFastCall;}
147
148  int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
149  void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
150
151  int getVarArgsStackOffset() const { return VarArgsStackOffset; }
152  void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
153
154  unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
155  void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
156
157  unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
158  void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
159
160  int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
161  void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
162
163  const SmallVector<unsigned, 3> &
164    getMustSaveCRs() const { return MustSaveCRs; }
165  void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); }
166};
167
168} // end of namespace llvm
169
170
171#endif
172