PPCMachineFunctionInfo.h revision 193323 
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 {
24private:
25  /// FramePointerSaveIndex - Frame index of where the old frame pointer is
26  /// stored.  Also used as an anchor for instructions that need to be altered
27  /// when using frame pointers (dyna_add, dyna_sub.)
28  int FramePointerSaveIndex;
29
30  /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
31  ///
32  int ReturnAddrSaveIndex;
33
34  /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
35  /// function.  This is only valid after the initial scan of the function by
36  /// PEI.
37  bool MustSaveLR;
38
39  /// SpillsCR - Indicates whether CR is spilled in the current function.
40  bool SpillsCR;
41
42  /// LRStoreRequired - The bool indicates whether there is some explicit use of
43  /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
44  /// requires that the code generator produce a store of LR to the stack on
45  /// entry, even though LR may otherwise apparently not be used.
46  bool LRStoreRequired;
47
48  /// MinReservedArea - This is the frame size that is at least reserved in a
49  /// potential caller (parameter+linkage area).
50  unsigned MinReservedArea;
51
52  /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
53  /// amount the stack pointer is adjusted to make the frame bigger for tail
54  /// calls. Used for creating an area before the register spill area.
55  int TailCallSPDelta;
56
57  /// HasFastCall - Does this function contain a fast call. Used to determine
58  /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
59  bool HasFastCall;
60
61public:
62  PPCFunctionInfo(MachineFunction &MF)
63    : FramePointerSaveIndex(0),
64      ReturnAddrSaveIndex(0),
65      SpillsCR(false),
66      LRStoreRequired(false),
67      MinReservedArea(0),
68      TailCallSPDelta(0),
69      HasFastCall(false) {}
70
71  int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
72  void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
73
74  int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
75  void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
76
77  unsigned getMinReservedArea() const { return MinReservedArea; }
78  void setMinReservedArea(unsigned size) { MinReservedArea = size; }
79
80  int getTailCallSPDelta() const { return TailCallSPDelta; }
81  void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
82
83  /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
84  /// scan of the function. It is true if the LR/LR8 register is ever explicitly
85  /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
86  /// which is used in PIC generation), or if the LR stack slot is explicitly
87  /// referenced by builtin_return_address.
88  void setMustSaveLR(bool U) { MustSaveLR = U; }
89  bool mustSaveLR() const    { return MustSaveLR; }
90
91  void setSpillsCR()       { SpillsCR = true; }
92  bool isCRSpilled() const { return SpillsCR; }
93
94  void setLRStoreRequired() { LRStoreRequired = true; }
95  bool isLRStoreRequired() const { return LRStoreRequired; }
96
97  void setHasFastCall() { HasFastCall = true; }
98  bool hasFastCall() const { return HasFastCall;}
99};
100
101} // end of namespace llvm
102
103
104#endif
105