PPCMachineFunctionInfo.h revision 263508 
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  /// Frame index where the old base pointer is stored.
36  int BasePointerSaveIndex;
37
38  /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
39  /// function.  This is only valid after the initial scan of the function by
40  /// PEI.
41  bool MustSaveLR;
42
43  /// Does this function have any stack spills.
44  bool HasSpills;
45
46  /// Does this function spill using instructions with only r+r (not r+i)
47  /// forms.
48  bool HasNonRISpills;
49
50  /// SpillsCR - Indicates whether CR is spilled in the current function.
51  bool SpillsCR;
52
53  /// Indicates whether VRSAVE is spilled in the current function.
54  bool SpillsVRSAVE;
55
56  /// LRStoreRequired - The bool indicates whether there is some explicit use of
57  /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
58  /// requires that the code generator produce a store of LR to the stack on
59  /// entry, even though LR may otherwise apparently not be used.
60  bool LRStoreRequired;
61
62  /// MinReservedArea - This is the frame size that is at least reserved in a
63  /// potential caller (parameter+linkage area).
64  unsigned MinReservedArea;
65
66  /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
67  /// amount the stack pointer is adjusted to make the frame bigger for tail
68  /// calls. Used for creating an area before the register spill area.
69  int TailCallSPDelta;
70
71  /// HasFastCall - Does this function contain a fast call. Used to determine
72  /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
73  bool HasFastCall;
74
75  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
76  int VarArgsFrameIndex;
77  /// VarArgsStackOffset - StackOffset for start of stack
78  /// arguments.
79  int VarArgsStackOffset;
80  /// VarArgsNumGPR - Index of the first unused integer
81  /// register for parameter passing.
82  unsigned VarArgsNumGPR;
83  /// VarArgsNumFPR - Index of the first unused double
84  /// register for parameter passing.
85  unsigned VarArgsNumFPR;
86
87  /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
88  int CRSpillFrameIndex;
89
90  /// If any of CR[2-4] need to be saved in the prologue and restored in the
91  /// epilogue then they are added to this array. This is used for the
92  /// 64-bit SVR4 ABI.
93  SmallVector<unsigned, 3> MustSaveCRs;
94
95public:
96  explicit PPCFunctionInfo(MachineFunction &MF)
97    : FramePointerSaveIndex(0),
98      ReturnAddrSaveIndex(0),
99      BasePointerSaveIndex(0),
100      HasSpills(false),
101      HasNonRISpills(false),
102      SpillsCR(false),
103      SpillsVRSAVE(false),
104      LRStoreRequired(false),
105      MinReservedArea(0),
106      TailCallSPDelta(0),
107      HasFastCall(false),
108      VarArgsFrameIndex(0),
109      VarArgsStackOffset(0),
110      VarArgsNumGPR(0),
111      VarArgsNumFPR(0),
112      CRSpillFrameIndex(0) {}
113
114  int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
115  void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
116
117  int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
118  void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
119
120  int getBasePointerSaveIndex() const { return BasePointerSaveIndex; }
121  void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; }
122
123  unsigned getMinReservedArea() const { return MinReservedArea; }
124  void setMinReservedArea(unsigned size) { MinReservedArea = size; }
125
126  int getTailCallSPDelta() const { return TailCallSPDelta; }
127  void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
128
129  /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
130  /// scan of the function. It is true if the LR/LR8 register is ever explicitly
131  /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
132  /// which is used in PIC generation), or if the LR stack slot is explicitly
133  /// referenced by builtin_return_address.
134  void setMustSaveLR(bool U) { MustSaveLR = U; }
135  bool mustSaveLR() const    { return MustSaveLR; }
136
137  void setHasSpills()      { HasSpills = true; }
138  bool hasSpills() const   { return HasSpills; }
139
140  void setHasNonRISpills()    { HasNonRISpills = true; }
141  bool hasNonRISpills() const { return HasNonRISpills; }
142
143  void setSpillsCR()       { SpillsCR = true; }
144  bool isCRSpilled() const { return SpillsCR; }
145
146  void setSpillsVRSAVE()       { SpillsVRSAVE = true; }
147  bool isVRSAVESpilled() const { return SpillsVRSAVE; }
148
149  void setLRStoreRequired() { LRStoreRequired = true; }
150  bool isLRStoreRequired() const { return LRStoreRequired; }
151
152  void setHasFastCall() { HasFastCall = true; }
153  bool hasFastCall() const { return HasFastCall;}
154
155  int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
156  void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
157
158  int getVarArgsStackOffset() const { return VarArgsStackOffset; }
159  void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
160
161  unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
162  void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
163
164  unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
165  void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
166
167  int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
168  void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
169
170  const SmallVectorImpl<unsigned> &
171    getMustSaveCRs() const { return MustSaveCRs; }
172  void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); }
173};
174
175} // end of namespace llvm
176
177
178#endif
179