1 //===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- C++ -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the PowerPC specific subclass of MachineFunctionInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef PPC_MACHINE_FUNCTION_INFO_H
15 #define PPC_MACHINE_FUNCTION_INFO_H
17 #include "llvm/CodeGen/MachineFunction.h"
21 /// PPCFunctionInfo - This class is derived from MachineFunction private
22 /// PowerPC target-specific information for each MachineFunction.
23 class PPCFunctionInfo : public MachineFunctionInfo {
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;
30 /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
32 int ReturnAddrSaveIndex;
34 /// UsesLR - Indicates whether LR is used in the current function. This is
35 /// only valid after the initial scan of the function by PEI.
38 /// SpillsCR - Indicates whether CR is spilled in the current function.
41 /// LRStoreRequired - The bool indicates whether there is some explicit use of
42 /// the LR/LR8 stack slot that is not obvious from scanning the code. This
43 /// requires that the code generator produce a store of LR to the stack on
44 /// entry, even though LR may otherwise apparently not be used.
47 PPCFunctionInfo(MachineFunction &MF)
48 : FramePointerSaveIndex(0),
49 ReturnAddrSaveIndex(0),
51 LRStoreRequired(false) {}
53 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
54 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
56 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
57 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
59 /// UsesLR - This is set when the prolog/epilog inserter does its initial scan
60 /// of the function, it is true if the LR/LR8 register is ever explicitly
61 /// accessed/clobbered in the machine function (e.g. by calls and movpctolr,
62 /// which is used in PIC generation).
63 void setUsesLR(bool U) { UsesLR = U; }
64 bool usesLR() const { return UsesLR; }
66 void setSpillsCR() { SpillsCR = true; }
67 bool isCRSpilled() const { return SpillsCR; }
69 void setLRStoreRequired() { LRStoreRequired = true; }
70 bool isLRStoreRequired() const { return LRStoreRequired; }
73 } // end of namespace llvm