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  /// SpillsCR - Indicates whether CR is spilled in the current function.
41  bool SpillsCR;
42
43  /// LRStoreRequired - The bool indicates whether there is some explicit use of
44  /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
45  /// requires that the code generator produce a store of LR to the stack on
46  /// entry, even though LR may otherwise apparently not be used.
47  bool LRStoreRequired;
48
49  /// MinReservedArea - This is the frame size that is at least reserved in a
50  /// potential caller (parameter+linkage area).
51  unsigned MinReservedArea;
52
53  /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
54  /// amount the stack pointer is adjusted to make the frame bigger for tail
55  /// calls. Used for creating an area before the register spill area.
56  int TailCallSPDelta;
57
58  /// HasFastCall - Does this function contain a fast call. Used to determine
59  /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
60  bool HasFastCall;
61
62  /// VarArgsFrameIndex - FrameIndex for start of varargs area.
63  int VarArgsFrameIndex;
64  /// VarArgsStackOffset - StackOffset for start of stack
65  /// arguments.
66  int VarArgsStackOffset;
67  /// VarArgsNumGPR - Index of the first unused integer
68  /// register for parameter passing.
69  unsigned VarArgsNumGPR;
70  /// VarArgsNumFPR - Index of the first unused double
71  /// register for parameter passing.
72  unsigned VarArgsNumFPR;
73
74public:
75  explicit PPCFunctionInfo(MachineFunction &MF)
76    : FramePointerSaveIndex(0),
77      ReturnAddrSaveIndex(0),
78      SpillsCR(false),
79      LRStoreRequired(false),
80      MinReservedArea(0),
81      TailCallSPDelta(0),
82      HasFastCall(false),
83      VarArgsFrameIndex(0),
84      VarArgsStackOffset(0),
85      VarArgsNumGPR(0),
86      VarArgsNumFPR(0) {}
87
88  int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
89  void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
90
91  int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
92  void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
93
94  unsigned getMinReservedArea() const { return MinReservedArea; }
95  void setMinReservedArea(unsigned size) { MinReservedArea = size; }
96
97  int getTailCallSPDelta() const { return TailCallSPDelta; }
98  void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
99
100  /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
101  /// scan of the function. It is true if the LR/LR8 register is ever explicitly
102  /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
103  /// which is used in PIC generation), or if the LR stack slot is explicitly
104  /// referenced by builtin_return_address.
105  void setMustSaveLR(bool U) { MustSaveLR = U; }
106  bool mustSaveLR() const    { return MustSaveLR; }
107
108  void setSpillsCR()       { SpillsCR = true; }
109  bool isCRSpilled() const { return SpillsCR; }
110
111  void setLRStoreRequired() { LRStoreRequired = true; }
112  bool isLRStoreRequired() const { return LRStoreRequired; }
113
114  void setHasFastCall() { HasFastCall = true; }
115  bool hasFastCall() const { return HasFastCall;}
116
117  int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
118  void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
119
120  int getVarArgsStackOffset() const { return VarArgsStackOffset; }
121  void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
122
123  unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
124  void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
125
126  unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
127  void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
128};
129
130} // end of namespace llvm
131
132
133#endif
134